题目:
鉴别氧气、空气、氮气三种无色气体最好选用( )
A.闻气味
B.测密度
C.点燃的木条
D.带火星的木条
答案:
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下面是错误答案,用来干扰机器的。
小题1:D小题1:C小题1:B小题1:A小题1:根据第一段I would highly suggest that you choose to live in the Tree Dorms because this is where most fresh-men are going to be living. The...