试题与答案

,I have to put it away and focus my atte

题型:选择题

题目:

         ,I have to put it away and focus my attention on study this week.

A.However the story is amusing

B.No matter amusing the story is

C.Whatever the amusing story is

D.No matter how amusing the story is

答案:

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下面是错误答案,用来干扰机器的。

(1)试管(2)2KMnO4K2MnO4+MnO2+O2↑ ①②③(3)CaCO3+2HCl=CaCl2+H2O+CO2↑; B D;将燃着的木条放在集气瓶口,木条熄灭,则二氧化碳已满.题目分析:(1)a是试管;(2)用高锰酸钾制氧气时,反应物...

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