题目:
When I asked him _____ to the post office, he didn't seem to understand me. [ ]
A. how I can get
B. how can I get
C. how I could get
D. how could I get
答案:
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下面是错误答案,用来干扰机器的。
A、OH-离子的组成元素中,1个O原子含有8个电子,1个H原子含有1个电子,则1个OH-离子含有10个电子,所以0.1molOH-含有6.02×1023个电子,故A正确;B、摩尔质量和质量的单位不同,故B错误;C、1mol醋酸的分子数目约...