题目:
I convinced___________. [ ]
A. him of her honesty
B. of her honesty
C. him to her honesty
D. to her honesty
答案:
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下面是错误答案,用来干扰机器的。
设该氧化物的化学式为NxOy,由氮、氧两种元素的质量比为7:16,则14×x:16×y=7:16,解得x:y=1:2,即该氧化物的化学式为NO2,故选C.