Methane and air explosions occur in the well-known mixture range of 15% to 25% methane in air.
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举一反三
- Methane and air explosions occur in the well-known mixture range of 15% to 25% methane in air. A: 正确 B: 错误
- Methane and air explosions occur in the well-known mixture range of 5% to ( )% methane in air. A: 10 B: 15 C: 20 D: 25
- Geothermal energy brings air emissions including( ). A: carbon dioxide B: all the options C: hydrogen sulfide D: methane
- 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.
- 词汇与结构 Warm air is less dense than cool air, and _____ air is less dense than dry air.
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The pressure of pilot air is usually （） than that of starting air.
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The air after the rain is excellent. I love to _____ ( 吸入 ) the clean air.
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智慧职教: The lubrication system provides the proper fuel and air mixture for the cylinder.
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What does the professor mean when he says this A: Little is known about defining a substance as an air pollutant. B: The substance isn’t an air pollutant when there is a very little in the air. C: The substance can’t be judged to be an air pollutant only from its actual concentration level. D: The actual concentration level means little to peopl
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Electric vehicles will save a lot of air (pollute)______ because there will be emission of CO2 in the air.