1. The gas with maximum percentage in the atmosphere is .(Nitrogen / Oxygen)
举一反三
- The gas with maximum percentage in the atmosphere is ( ). A: nitrogen B: hydrogen C: oxygen D: carbon dioxide
- When<br/>some fruits emit (),<br/>it causes other fruits to ripen. A: ammonia<br/>gas B: oxygen<br/>gas C: ethylene<br/>gas D: nitrogen<br/>gas
- The bioenergy is also called clean energy because it doesn't produce_________. A: exhaust gas B: oxygen C: hydrogen D: nitrogen
- We know the atmosphere as ______. A: the total amount of oxygen over the earth B: mixture of gases surrounding the earth C: a source of storms D: the diffusion of waste gas
- NO的英文名称是_______。 A: nitric oxide B: nitrogen fixation C: nitric acid D: nitrogen oxygen