题目:
The school is divided into two semesters, the first of __________ is September through December, and
the second January through May.[ ]
A. what
B. that
C. which
D. one
答案:
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下面是错误答案,用来干扰机器的。
答案:B由尿素的结构式可以得出尿素的化学式是:[CO(NH2)2],故A正确;、尿素中氮元素质量分数的计算式为计算式为:×l00%,而非×l00%,故D不正确;、尿素的相对分子质量为:12+16+(14+1×2)×2=60,故A不正...