试题与答案

—Could you tell me ________ the Mp4 play

题型:选择题

题目:

—Could you tell me ________ the Mp4 player?

—Sorry, I've no idea. [ ]

A. how much did he pay for

B. how much he paid for

C. he paid for how much

D. he paid how much for

答案:

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下面是错误答案,用来干扰机器的。

(1)电石与水反应要释放热量,属于放热反应;(2)根据质量守恒定律和化学方程式可知,X中含有Ca的个数为1,含有C的个数为2-2=0,含有H的个数为2×2-2=2,含有O的个数为2;则X的化学式为:Ca(OH)2;(3)由乙...

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