The pressure of pilot air is usually （） than that of starting air.

词汇与结构 Warm air is less dense than cool air, and _____ air is less dense than dry air.

The air after the rain is excellent. I love to _____ ( 吸入 ) the clean air.

Electric vehicles will save a lot of air (pollute)______ because there will be emission of CO2 in the air.

Electric vehicles will save a lot of air (pollute)______ because there will be no mission of CO2 in the air.

Electric vehicles will save a lot of air (pollute) _________ because there will be no emmision of CO2 in the air.

Methane and air explosions occur in the well-known mixture range of 15% to 25% methane in air.

34. Electric vehicles will save a lot of air (pollute) ________ because there will be no emission of CO2 in the air.

智慧职教: Electric vehicles will save a lot of air (pollute) _________ because there will be no emission of CO2 in the air.

Air pollution is becoming worse. As is known to all, air to us is ________ water to fish. No one can imagine how human being can live without air.