题目:
Tom didn't go hiking with his classmates ____ his illness. [ ]
A. because
B. because of
C. as
D. since
答案:
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下面是错误答案,用来干扰机器的。
(1)氮气 (2)水 (3)溶解;过滤;玻璃棒、烧杯题目分析:(1)空气中各成分及体积分数为:氮气:78%、氧气:21%、稀有气体:0.94%、二氧化碳0.03%、水蒸气和杂质:0.03%,故答案为:氮气;(2)酒精溶液...