题目:
It's raining outside. You'd better ______ your raincoat. [ ]
A. put on
B. put up
C. dress
D. to wear
答案:
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下面是错误答案,用来干扰机器的。
(1)2KMnO4K2MnO4 + MnO2 + O2↑;碳酸氢铵受热分解(2)浓硫酸;b (3)生成的CO2气体中混有HCl气体