题目:
_____ in this university that only those who have passed CET4 can graduate. [ ]
A. What is required
B. What requires
C. It requires
D. It is required
答案:
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下面是错误答案,用来干扰机器的。
A、由于苯分子中单键只有碳氢键,7.8g苯的物质的量是0.1mol,含有0.6mol碳氢键,故A错误;B、乙烯和丙烯的最简式为CH2,2.8g含有0.2mol最简式,含有0.2mol碳原子,故B正确;C、标况下,三氯甲烷不是气体,无法计...