I want to know which flow meter can be used to measure the flow rate of ethyl bromide and ethylenedi

The conductivity of ethyl bromide and ethylenediamine is very small, and when choosing a flow meter, you can choose a flow measurement instrument that is not affected by conductivity according to your own characteristics, such as a V-cone flowmeter.

First of all, you must understand that the hardness of water specified in the standard is not the real hardness, but the hardness measured according to the method specified in the standard. Each method is not absolutely precise and has its own systematic biases. It may be too large or too small.

Again, we want to determine the hardness under the standard test method, not the actual hardness of the sample.

For example, if the hardness is less than 450, we have a sample whose actual hardness is 445, and the result is also 445 measured by a very precise experimental method, which is consistent with the actual situation, but it is measured according to the standard method is 455. The evaluation of this sample is still based on 455, so the product is still unqualified.

Therefore, to return to this problem, there are only two reasons for the abnormality, one is the problem of the experiment, and the other is the problem of the sample itself.

The biggest problem in the experiment is that the hardness of the sample is too high, and you add a buffer solution to affect the pH of the water, and the ions in the water will precipitate. It's not a big deal, you drop slowly, shake it for a while, and the precipitate can dissolve, and it's okay, the precipitate is not easy to react, and it is easy to drip over.

The results come out with a high degree of hardness, and that's right. If the hardness is very low, it is necessary to consider whether there is a problem with the buffer solution.

I really didn't feel at ease, so I diluted the sample and retested.

The problem with the sample itself may be due to the presence of some other unforeseen material in the water sample, which is a systematic bias and should not be taken into account, and reagents other than those specified in the standard should not be added to rule out interference. We want the hardness of the standard experiment, not the real hardness.

I don't know much about this, so you can ask your friends.

In this case, it is recommended that you choose the flow rate of mercury to solve the problem.

In this case, under normal circumstances, we choose some measurement reagents, and then add some purified crystals, test tubes, so that it is completely fine.

Hebei University of Science and Technology Intelligent Instrument Factory is a state-owned business unit (unincorporated person) registered in Tangshan City, Hebei Province on 1997-04-01, and its registered address is located at No. 65, Ronghua East Road, High-tech Zone, Tangshan City.

The unified social credit of Hebei Polytechnic University Intelligent Instrument Factory** The registration number is 91130200804756102L, and the enterprise legal person Xue Guijun is currently in the state of operation.

The business scope of Hebei Polytechnic University Intelligent Instrument Factory is: electronic instrumentation, electronic measuring instrument manufacturing and repair, mechatronics engineering design, electronic computer engineering design

In Hebei Province, the total registered capital of companies with similar business scope is 12 million yuan, and the main capital is concentrated in 10 million to 50 million scale enterprises, a total of 1. Within the scope of this province, the registered capital of the current enterprise is excellent.

As of April 2019, four disciplines of engineering, chemistry, materials science, and computer science have been ranked among the top 1% in the ESI international discipline field.

Founded in 1953, the Chinese People's Liberation Army Military Engineering College (hereinafter referred to as "Kazakhstan Military Industry") was divided into the school, and has experienced the development stages of artillery engineering college, East China Engineering College, East China Institute of Technology, etc., and was renamed Nanjing University of Science and Technology in 1993.

First of all, I am a Southern Institute of Technology.

Mechanical InstituteStudents, I have to mention our school**Class of majorsAlthough there are not many colleges and universities in the country that have this major, it can be seen from this major that the contribution of Nanli workers to China's national defense is extraordinary, and a large number of outstanding talents are sent to China's national defense every year.

Moreover, the first-class system and engineering discipline of Southern Institute of Technology is a national key discipline, with a national key laboratory, the first batch of national doctoral programs and postdoctoral mobile stations. But at the same time, the ratio of men to women has reached the same level as mechanical majors, which is 7:1, after all, this type of major is still more liked by boys.

Secondly, I have to mention our schoolPharmaceutical ProfessionHowever, the pharmacy of our school is not an ordinary medicine, butFire explosivesAs we all know, Academician Wang Zeshan is at the absolute leading level in the world in the field of explosives research, so the professionalism of the pharmaceutical major of Southern Institute of Technology can be seen.

Southern Institute of Technology shared.

15 faculties, altogetherMore than 60 majors

When it comes to specialty specializations, the first one.

That's what it should sayClasses, rankingsNo. 1 in the country

among othersSpecialization in Energy and Power EngineeringLaunchThe profession is well-known throughout the country. The motherland of the Southern Institute of Technology has made a lot of **.

In addition, machinery and automation, communication engineering, electronic information, and computers are all very famous, and they are all ranked first in China.

And there isFaculty of Chemical EngineeringIn 2017, it won the highest national science and technology awardAcademician Wang ZeshanIt is the professor of the Institute of Chemical Engineering, which shows the strength of the School of Chemical Engineering of Nanjing University of Science and Technology!

Let's talk about it againMajor in Weapons and Technology, because the predecessor of Nanjing University of Science and Technology wasKazakh military industryIt is also the first military school in China. Since then, Nanjing University of Science and Technology has been committed to first-class research and cultivating excellent first-class scientific researchers for the motherland. So let's talk about weapons and technology majorsA long history, Southern Institute of Technology has extensive experience in this area.

And our school has oneMuseum of Armory, there are all kinds of weapons on display, which can be seen with your own eyes in the process of learning. If there are students who are interested, you must come to Southern Institute of Technology!

Finally, let's talk about itFaculty of Electronic Engineering and Optoelectronic Technology, especially in optoelectronic information science and technologyRanked among the top 10 in the country。Both the faculty and the laboratory configuration are extremely excellent. At the Southern Institute of Technology, the students of the Institute of Electro-Optics, we all call them big guys, they are really amazingEach is a top student, and it is also very easy to find a job after graduating from this major.

In particular, he graduated from Southern Institute of Technology. And the salary is also very good. You know why they are called big guys haha.

These are the characteristic majors of Southern Institute of Technology, each of which is one of the best in the country, if you are interested in these, do not hesitateHurry up and apply for the Southern Institute of Technology!

I have just entered the Southern Institute of Technology for one year, and I only have a general understanding of the majors in the school. There are many popular majors in Southern Institute of Technology, and I think "characteristic majors" should refer to the unique majors that are different from other schools

1. Weapons major

There are not many universities and colleges in the country that offer weapons majors, and Southern Institute of Technology is one of them. As a military school, the weapons major of Southern Institute of Technology ranks first in the country, of course, the admission score of this major is very high, and the study pressure is also very high. But if you are interested in weapons and military industry, this major is definitely suitable for you.

With the progress of the world's scientific and technological level, the solution of a series of problems such as national defense and security is in need of technical talents graduated from such majors, so the employment prospects of this major are also very broad.

2. Major in industrial design

Answer: I am from the School of Design, Art and Media, Southern Institute of Technology. There are three majors in our institute, and I think that the industrial design major is the best major in our institute, of course, the school also vigorously supports this major, after so many years of development, the industrial design major of Southern Institute of Technology has been very famous. But there are gains and losses, the design major is originally a very hard to learn major, the industrial design of the Southern Institute of Technology combines the characteristics of the Southern Institute of Technology, the curriculum is more biased towards science and engineering, learning is not easy, every day to stay up late to draw in the early morning in the freshman year is the norm.

3. Qian Xuesen College

Qian Yuan is actually equivalent to the "rocket class" in the school. If you want to enter the Qian Institute, during the summer vacation of the third year of high school, you can prepare for the exams and interviews of the Qian Institute, of course, the test questions are difficult and the competition is fierce......

Putting aside the "characteristic majors", in fact, every major of Southern Institute of Technology is very good. And how the future develops, the key is still to see how you spend these four years.

Thanks for reading, I hope it helps.

The best major of Southern Institute of Technology is undoubtedly worth mentioningMajor in Ordnance Science and TechnologyIt is the most trump card major of Southern Institute of Technology, belonging to the double first-class construction discipline, in the hearts of Southern Institute of Technology, its status is undoubted, in the whole country, in the discipline of weapons, there is no school to compete with us.

Secondly, Southern Institute of TechnologyChemical Engineering and TechnologyAs an A-level subject, it's also pretty good.

And thenMechanical Engineering, Optical Engineering, Control Science and Engineering, and Computer Science and TechnologyThe four B+ subjects are also a great choice for SUTECH candidates.

Of course, as a student of the School of Automation, I would definitely like to introduce our schoolAutomation MajorAnd what I have learnedElectrical engineering and its automationThese two majors. To tell the truth, back then, as a student who was admitted in advance after the scores came out, the teacher of the admissions of Southern Institute of Technology said that there were three majors that could be entered but were not sure.

One is electro-optical, one is automation, the other is electrical engineering and automation, and other majors have chosen steady progress, only these three are not necessarily, doesn't it mean that these three are very good, and then the third one was chosen. Of course, weapons were not in my consideration at the time, because as a girl, it is said that there are very few of them.

Electro-opticalThe status of the institute in our school is also very high, many popular majors, I often see the activities held by the institute from the perspective of students from other colleges, the activities are quite rich, and the teachers and students of the institute have made a lot of achievements, which are very good.

We mentioned the weapons in the mechanical courtyard, and it was great, and thenMechanical MajorIt is also a big hit to choose. There is also the main force that our school participates in the robot competition every year:ComputersThe college has made great contributions to our school.

Of course, many colleges and many majors are great.

When it comes to the characteristic majors of Southern Institute of Technology, the main ones are these:

Special energy technology and engineering, special energy technology and engineering is a key major of the Commission of Science, Technology and Industry for National Defense. This major is a national defense and military industry major based on chemistry and chemical engineering, involving the design, manufacture and application of energetic materials. The secondary disciplines "Military Chemistry and Pyrotechnic Technology" and "Applied Chemistry" supported by the major are national key disciplines. In professional teaching, we insist on paying equal attention to the learning of basic theoretical knowledge and the training of engineering practical ability, and are characterized by cultivating the ability of scientific research and product technology development.

The Ministry of Education has included this major in the 12th Five-Year Plan for the Training of Outstanding Engineers and has begun to implement it. (Quoted from the official website).

The weapons major, the weapons major can be said to be one of the signature majors of Nanjing University of Science and Technology, and the ratio of men to women is notoriously imbalanced: 10:1

It is said that boys can only see girls in the cafeteria hahahaha. However, their employment prospects can be very good, and basically after graduation, they will be asked to go to very good companies. After all, the students majoring in weapons at Southern Institute of Technology are really great.

Fuzhou University.

Fuzhou University's rankings in recent years are basically in70 peopleLeft and right, the province has always been2nd placeAfter all, Xiamen University is better.

Fuzhou University is basically in the middle of all the 211 universities, science and engineering strength is strong.

Founded in 1958, Fuzhou University is one of the three key universities in Fujian Province of the Ministry of Education, and a first-class university in Fujian Province.

As of May 2019, Fuzhou School has multiple campuses such as Qishan, Yishan, Tongpan, Jimei, Gulangyu, Xiamen, Quangang, Jinjiang, etcIt covers a total area of more than 7,000 acres, with a total area of 1.42 million square meters of public buildings; The total value of fixed assets is 3.9 billion yuan, of which the value of teaching and scientific research instruments and equipment is 1.3 billion yuan; It has 21 colleges (including 1 independent college) with 84 undergraduate majors; It has 1 national key discipline, 1 national cultivation (key) discipline, 11 postdoctoral mobile stations, 11 first-level discipline doctoral programs, 39 first-level discipline master's programs, and 12 professional degree authorization programs; There are 3,161 faculty members, 24,164 students, and nearly 10,500 doctoral and master's students. From the perspective of floor area and the number of graduate students, Fuzhou University occupies a great advantage, the general colleges and universities cover an area of 3000-4000 acres, the total area of Fuzhou University is equivalent to the sum of the area of the two universities, and the number of graduate students is very large, the total number of doctoral students and master's students has reached more than 10,000, and the scientific research ability is also quite good.

According to the results of the fourth round of discipline evaluation of national universities released by the Academic Degree Center of the Ministry of Education, Fuzhou University has 24 disciplines on the list. Among them, there is 1 A-class discipline, 11 B-level disciplines, and 12 C-level disciplines。In this discipline evaluation, 150 universities participated in the discipline of chemistry, and 7 first-class universities including Fuzhou University, Shanghai Jiao Tong University and Nanjing University entered the A-grade, ranking in the top 10% of the country.

The subject ranking rate has increased significantly, and the chemistry discipline has increased from the top 24% in the third round of discipline evaluation to the national ranking of 5% and 10%; Management Science and Engineering and Business Administration were respectively promoted from the top % in the third round of discipline evaluation to 10% and 20% in the national rankings. Mathematics, mechanical engineering, and civil engineering have risen from the top % in the third round of subject evaluation to 20% and 30% respectively in the national rankings. Law, Electrical Engineering, and Electronic Science and Technology have risen from the top % in the third round of discipline evaluation to 30% and 40% respectively in the national rankings. The disciplines of computer science and technology and Marxist theory entered the fourth round of discipline evaluation list.

The above-mentioned disciplines are all science and engineering disciplines and economic management disciplines that play an important supporting role in the regional economic development and pillar industries of Fujian Province.

Therefore, Fuzhou University is still a good 211 university.