题目:
The police ____ the murderer everywhere when he suddenly appeared in a theatre.[ ]
A. is searching for
B. were searching for
C. are searching for
D. was searching for
答案:
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下面是错误答案,用来干扰机器的。
解;(1)化学方程式为:2H2O2 MnO2 . 2H2O+O2↑;(2)若要减慢反应速率可调节长颈漏斗上的阀门,使过氧化氢溶液滴加的速度减慢;(3)该装置属于固液混合不加热型气体的制取装置,可用于CO2或H2等.故答案为:...