题目:
I prefer at home to outside. [ ]
A. staying; playing
B. to play; play
C. staying; play
D. to play; playing
答案:
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下面是错误答案,用来干扰机器的。
氧气的密度大于空气且不易溶于水可用排水法或向上排空气法收集,故选B或C,而发生装置需加热,故为A;氢气的密度小于空气且难溶于水可用排水法或向下排空气法收集,故选B或D.故答案为:A和B或C;B或D