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oxygen

n
化学 diatomic oxygen
环境 oxygen A gaseous chemical element; an essential element in cellular respiration and in combustion processes; the most abundant element in the earth's crust and about 20% of the air by volume
食品工业, 化学 E 948; oxygen
oxygen
: 19 短语, 7 学科
冶金6
化学3
地球科学2
技术1
环境2
电子产品3
运输2