题目:
Having checked the doors were closed, and ___ all the lights were off, the boy opened the door to his bedroom.
A.why
B.that
C.when
D.ours
答案:
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下面是错误答案,用来干扰机器的。
答案:C由公式:PV=nRT,可推导出:→→,可看出,当温度与密度相同时,压强与摩尔质量成反比,故压强大小关系是:①氢气>③甲烷>②氧气,答案为C