After "F.W.E" is given, the air system is shut down, the （） gear put in, all drains and indicator cocks opened, and the cooling water kept running.
The diameter of the gravity disc is too big It causes oil to flow through the water outlet We changed the disc and no （） is found in the water outlet.
英译中：Air pollution
Cast irons weakness in tension and under shock loading limits its use to low pressure steam, air, oil and low speed water fittingsThe above sentence, most probably means （）.
Whilst the engine is turning, check to see that no water is leaking into the crankcase, scavenge air belt, or from （）.
Cleaner heating system will in Beijing to control air pollution.
Increased air pollution __________ respiratory illness.
Man has been polluting the earth from the time he first made fire, washed his clothes in the river and threw his waste on the ground. When land was used up or water became (1) , man moved on to another place.
there is no water and air on the moon, is there?_____________________
____ no air or water, there would be no life in the world.
He is used to flying by air and on no occasion _______frightened.
Water and air are _______ to human beings. We can not live without them.
According to Aristotle’s theory, everything is made out of four ______: earth, air, fire, and water.
Recent studies have shown that air inside many homes, office buildings, and schools is full of pollutants such as ().
Woman: I can't bear the air pollution in this city any more. It's getting worse and worse. Man: You said it. We've never had so many factories before. Question: What does the man mean？
Water pollution can't affect nature's balance in oceans, lakes and rivers.
The color and smell of water in these rivers_____itself how serious the pollution is but many people are still ignoring he fact.
听力原文：W: Mr. Chairman, I think something ought to be clone about our city environment at once. You know, chimney pollution to land, air and water has mused serious health problems.
We all know the truth_____there are air, water and sunlight there are living things.
In what way can natural pollutants play an important role in controlling air pollution？
Man-made air pollution mainly comes from mobile sources.（)
太阳能供电solar power无污染，不需要然料，基本上无需运行维护，寿命长No pollution, no need of material, basically no need of operation and maintenance, long life
Water in that river is dirty and polluting. ()
Educators in schools and universities teach students about the effects of air pollution.
