题目:
The criminal _____ fire to a store and after a moment the whole store _____ fire. [ ]
A. made a; lit a
B. set a; caught
C. caught; was on
D. set; was on
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:根据物质的结构简式可知,A中含有3类氢原子,B中含有2类氢原子,C中4类氢原子,D中2类氢原子,所以一氯取代物种数最多的是C,答案选C。点评:有机物中等效氢原子的判断一般方法是同一个碳原子上...