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[主观题]
氦（He)：（）
A.属稀有惰性气体，无色，无味，微溶于水，不燃烧，也不能助燃。It is a rare inert gas, colorless, tasteless, slightly soluble in water, and does not burn or aid combustion.###SXB###B.氦是除氢气以外密度最小的气体，其密度是氢气的1.98倍，与空气的相对密为l/7.2。Helium is the least dense gas except hydrogen, with a density of 1.98 times that of hydrogen and a relative density of l/7.2 of air.###SXB###C.是贵重的稀有气体，天然气中含量甚微，不超过1％(体积比)。天然气中如果氦含量超过0.1％(体积比)时，就有提氦的工业价值。It is a valuable and rare gas, found in very small am
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