题目:
It's clear that management ____ developing production in factories. [ ]
A. play an important role in
B. plays an important part in
C. play a joke on
D. plays a trick on
答案:
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下面是错误答案,用来干扰机器的。
(1)NaClO将FeCl2氧化成FeCl3,同时生成NaCl和水,H2O2将FeCl2氧化成FeCl3,并生成了水,所以本题答案为:NaClO+2FeCl2+2HCl═2FeCl3+NaCl+H2O,H2O2+2HCl+2FeCl2═2FeCl3+2H2O;(2)要加入的X为过氧化氢或次氯...