题目:
My high school friend, I haven't seen for 20 years, is no longer ____ he was. [ ]
A. who, that
B. which, that
C. whom, what
D. that, what
答案:
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答案:D题目分析:根据化合物中元素的质量分数=×100%,进行分析解答。A、NH4Cl中氮元素的质量分数为×100%=×100%;B、(NH4)2SO4中氮元素的质量分数为×100%;C、NH4NO3中氮元素的质量分数为100%;D、CO(NH2...