How big are the first and second opens? How big is it?

The first is as big as a big newspaper (people**), and the second is as big as folding the newspaper in half. The magazines we read are generally sixteen open.

787 1092mm, most of the copyright pages of the book are written with this size, the so-called 2 open, that is, the paper is folded in half, and then folded in half to 4 open, then folded in half 8 open, 16 open, 32 open......Our average textbook is 32 pages, and 16 pages are the size of a general magazine. There is also a large size of 850 1168mm.

Attached: Positive paper: 787 1092mm

Number of openings (positive) Dimensions in (mm).

Full open 781 1086

2 open 530 760

3 open 362 781

4 open 390 543

6 open 362 390

8 open 271 390

16 open 195 271

Note: Finished product size = paper size trimming size.

Generous paper: 850 1168mm

Number of openings (positive) Dimensions in (mm).

Full open 844 1162

2 open 581 844

3 open 387 844

4 open 422 581

6 open 387 422

Is it a printing thing?

One is about the size of a common desk. After the split, it is 1/4 of the upper opening area.

The size of the paper folio is half the area. The folio of half of the paper is to fold the paper in half, so that the paper after the folio is 1/4 of the original.

For example, A1 paper is A1 after folio, A2 after A1 folio, A3 after A2 folio, A4 after A3, and the size of our commonly used copy paper is generally A4.

The standard 1-carat paper size (domestic standard) is 787 1092mm. The standard 1-carat paper size (international standard) is 850x1168mm.

Fold the whole paper in half into a folio, and fold the folio paper in half to make a quadruple sheet.

Positive paper: 787 1092mm

Number of openings (positive) Dimensions in (mm).

Full open 781 1086

2 open 530 760 3 open 362 7814 open 390 543 6 open 362 3908 open 271 390

16 open 195 271

Note: Finished product size = paper size trimming size.

Generous paper: 850 1168mm

Number of openings (positive) Dimensions in (mm).

Full open 844 1162

2 open 581 844 3 open 387 8444 open 422 581 6 open 387 4228 open 290 422

Note: Finished product size = paper size trimming size.

Summary. Open is the size of the paper, a large open, the standard size of a open paper is 787 1092mm, the other open, refers to the open paper divided into how many parts. Such as:

The size of a paper folded in half is two open, and then folded in half is four open, and then it is 8 open, 16 open, and 32 open. Therefore, there is only an index of 2 on the number of openings, and there will be no numbers such as "three open" and "five open".

How big is it? How did it come about?

Open is the size of the paper, a large open, the standard size of a open paper is 787 1092mm, the other open, refers to the open paper divided into how many parts. For example, the size of a paper folded in half is two open, and then folded in half is four open, and then it is 8 open, 16 open, and 32 open.

Therefore, there is only an index of 2 on the number of openings, and there will be no numbers such as "three open" and "five open".

How did the opening come about.

How did the opening come about.

Generosity is an international standard (code: A1-A5), and Zhengdu is a Chinese standard (code: B1-B5).

The international standard of generosity is slightly larger than the Chinese standard of Zhengdu. A4 paper international standard (magnanimity): 297*210mm; 1 of the paper is fully open (the book is:

Full-format version), 2 open is folded in half on the basis of 1 open, and so on, 16 open is 1 open 1 16 (i.e., A4 size). In reality, common paper sizes are:

4 open (often used in newspapers open (often used in magazines open (often used in books open (often used in ***, small and medium-sized dictionaries).

It originated from that country.

It originated from that country.

Kai originated in China, and the printing industry was called that at the beginning, so it continues to this day.

Is there an international standard for opening, is it internationally applicable?

Is there an international standard for opening, is it internationally applicable?

Only we Chinese say this.

No, there is an international standard exchange.

No, there is an international standard exchange.

But foreigners don't call it open.

That's right, that's why I wonder where it originated.

That's right, that's why I wonder where it originated.

There is an international standard for paper, and there is a national standard in our country. It is recommended that you don't dwell too much on this matter. 

You're talking about one, two, and three in drilling, and they mean as follows:

1. The first time to open the drill pie and (one open):

drilling the surface layer, the lower surface casing, cementing; Then the wellhead is loaded; Re-test pressure; Finally, the installation of the blowout prevention equipment.

2. The second drilling (two opening):

Drilling; Mid-way testing; The sedan is lowered into the technical casing and cemented.

3. The third drilling (three opening):

Installation of wellheads, pressure testing; drilling, drilling open air layers; electrical measurement of completions; Production casing and cementing.

Precautions for drilling construction:

1. Dig the mud pool between the holes to be drilled and the holes are dug between the two holes in the direction of the buried pipe trench, which is used as the water circulation carrier of the drilling rig in the construction and does not flow to other places to ensure the cleanliness of the construction site.

2. Before drilling, the drilling position should be determined according to the axis of the construction drawing to ensure that the error of the drilling point is less than 50mm, and the drilling site should be leveled.

3. Before drilling, the integrity of the equipment must be checked from beginning to end. Inspections include: Determining the correct steering, re-checking the tower chassis, and the horizontal and vertical levels of the vertical pole closures. Drilling can only be started when it is confirmed that there is no abnormality.

4. In the process of drilling, according to the underground geological conditions, the depth, number and location of the borehole should be appropriately adjusted to meet the design requirements and reduce the difficulty of borehole pipe and sealing.

5. During the drilling process, arrange professional quality inspectors to check the drilling position at any time to ensure the correctness of the pipe hole position and the plumb degree of the drilling, avoid rework and make inspection records. <>