• 2021-04-14
    Is oxygen the only gas ( ) helps fire burn?
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      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

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      Now my house is less drafty and it helps a bit with the gas bill.

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      The gas with maximum percentage in the atmosphere is ( ). A: nitrogen B: hydrogen C: oxygen D: carbon dioxide

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      The China-Myanmar oil and gas pipeline project helps China in ensuring energy safety for it ______.

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      A ______ refers to an injury caused by heat, fire or radiation, etc. A: amputation B: pain C: stroke D: burn