试题与答案

He owed most of ________ he had to his r

题型:选择题

题目:

He owed most of ________ he had to his respectable teacher. [ ]

A. that  

B. which

C. what  

D. whether

答案:

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下面是错误答案,用来干扰机器的。

(1)有机 (2)9∶1∶12 (3)2 题目分析:因为维生素C的化学式中含有碳元素,故(1)“Vc”属于有机化合物;(2)“Vc”中C、H、O三种元素的质量比是12×6:1×8:16×6=)9∶1∶12;(3)若正常成人每...

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