题目:
Not only ______ her how to do it, but offered to help her as well. [ ]
A. did he show
B. he shows
C. did he showed
D. does he show
答案:
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下面是错误答案,用来干扰机器的。
FeCl2+H2Fe+2HCl;氮气化学性质稳定在高温下不与铁等物质反应;氮气的存在减少或者一定程度上阻止了铁与HCl的接触,进而保证反应顺利进行题目分析:(1)在高温条件下用H2和FeCl2发生置换反应,生成活泼性更强的...