There is an urgent need for an article on the changes in land resources in my hometown

Constituent elements of land resources: climatic factors, geological factors, hydrology and geochemistry, soil elements, biological factors, and socio-economic factors.

Legal analysis. If the flow rate is much lower than the minimum flow rate to ensure accuracy, it will result in no output (e.g., vortex flowmeter) or the output signal will be cut off as a small signal (e.g., differential pressure flowmeter), which is unfavorable and unfair to the supplier. In order to prevent the loss of benefits, for a specific set of thermal energy metering equipment, the supply and demand parties often agree that a certain flow value is "agreed lower limit flow" according to the flow measurement range and the range that can be achieved, and if the actual flow rate is less than the agreed value, the lower limit of the charging flow will be charged.

The people's metrology administrative departments at or above the county level may set up metrological verification institutions as needed, or authorize the metrological verification institutions of other units to carry out compulsory verification and other verification and testing tasks. Personnel who perform the verification and testing tasks provided for in the preceding paragraph must pass the assessment. This function is usually implemented in flow meters.

According to the needs of the region, the local people's measurement administrative department at or above the county level shall establish social public measurement standard instruments, which shall be used after passing the examination by the people's measurement administrative department at a higher level. Enterprises and institutions may establish the measurement standard instruments used by the unit according to their needs, and the highest measurement standard instruments shall be used after passing the examination presided over by the relevant people's measurement administrative department. Metrological verification work should be carried out in accordance with the principle of reasonable economic judgment, and be carried out locally and nearby.

Metrological verification must be carried out in accordance with the national metrological verification system table. The national metrology verification system table shall be formulated by the administrative department of metrology.

Friend, when you are living a happy and peaceful life, have you ever thought that our living environment is deteriorating step by step? When you clean your beautiful yard, have you ever thought about the white garbage that can be found everywhere around us? When you are fully enjoying the warm spring sunshine, have you ever thought that the sky over Antarctica has lost the protection of the ozone layer?

Once upon a time, the sky was so blue, the rivers were so clear, the forests were so dense, and while the natural environment gave us the enjoyment of beauty, human beings were also asking for things that they did not deserve from nature... …

In 1998, the Yangtze River, Nenjiang River, Songhua River and other great rivers flowing through the land of China hid the gentle and beautiful smiles of the past, revealing a fierce and terrifying hideousness. The raging torrential rain swept across the south and north of China, and everywhere the torrential rain went, the rivers and lakes swelled and the river ditches overflowed. The roaring river swept up flood peaks again and again, swallowing up villages, fertile fields, cities and counties, factories, and schools.

The raging flood is like a merciless devil's claw, tens of millions of acres of fertile land have been flooded, and millions of people have lost their homes. The mighty river is creating dangers big and small every day. The violent bake demon brews dangers big and small.

The violent devil brews tragedies big and small. Only by giving water a home and giving all living beings a home, will human beings have their own homes, and human beings will have their own homes; Only by giving water a way to live and all living beings a way to live can human beings survive and develop.

If ancient science has not yet developed, and the people of the earth have certain limitations in their understanding of ecology, and have done stupid things that only care about the present and ignore the long-term, then what about modern people? In the 30 years from 1950 to 1980, more than half of the world's forests were destroyed, with half of Africa's forests becoming barren. Green vegetation is the "quilt of life" given by nature to human beings.

However, after the world entered the 20th century 50 years, the green environment on which people and animals depend for survival has been destroyed, the green vegetation is declining, the global soil loss is now increasing to 25.4 billion tons per year, and the desertified soil is expanding rapidly at a rate of 5-70,000 square kilometers per year.

The earth is becoming more and more crowded, and with it, environmental pollution is changing day by day, and resources are becoming scarce. In the pursuit of happiness, people have to look back at the relationship between man and nature, and sign a covenant with nature for sustainable development. All of this reminds us that:

Environmental protection is imminent!

We live on the same land, we share a common homeland and protect our environment. The earth is looking forward to green, the rivers are looking forward to green, the waterfowl are looking forward to green, and the flowers are looking forward to green. Dripping water into a river, accumulating soil into a mountain, protecting the environment, starting from you and me.

Awaken the "green heart" and implement the "green plan". Carry out "green action", strive to be a "green builder, and create a "green new century"!

Don't you feel sick when you walk on a wide road, admiring the green trees and red flowers next to you, and suddenly smell the stench of sewage coming from your nose? When you are walking on the golden sand, the sea breeze is blowing on you, and you are in a very good mood, and suddenly a plastic bag flies in your face, don't you feel disappointed? Don't you feel irritated when you hear the noise of a nearby construction site while you are studying?

The earth belongs to everyone, and environmental protection depends on everyone. If we want to live comfortably and have a beautiful living environment, we have to take care of every grass and tree in nature.

In fruits, vegetables, crops, flowers, grasses, fields, rivers, ......Water is everywhere and never stops. If a person does not drink water for three days, he will die. You can see how important water is.

At present, only 3% of the earth's fresh water is the earth's water source, and of this 3%, only most of the earth's freshwater is polluted, so it is an urgent task for mankind to protect water resources. Students, let's take action! When you see the water from the faucet rushing, you step forward and twist it tightly with your hands; When strolling along the river, don't throw the garbage in your hand into the river; Don't waste the water used to wash clothes, use it to flush the toilet, and try to achieve the ...... of "one water for multiple purposes".I believe that through our efforts, we will turn the desert into a lovely oasis; It will make the grass fatter and the trees greener; will let the water in the creek.