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
A: 10
B: 15
C: 20
D: 25
举一反三
- Methane and air explosions occur in the well-known mixture range of 15% to 25% methane in air.
- Methane and air explosions occur in the well-known mixture range of 15% to 25% methane in air. A: 正确 B: 错误
- 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.