题目:
Why __________ put the meat in the fridge? It'll stay fresh for several days. [ ]
A. not
B. not you
C. you
D. do you
答案:
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答案:A题目分析:A、N2和C2H4的摩尔质量相等,质量相等的N2和C2H4的物质的量相等,含有的分子数相同,正确;B、体积相同的N2和C2H4的分子数不一定相等,缺少等温等压条件,错误;C、等温、等体积的N2和O2,分子...