试题与答案

In some places in Yunnan, women are expe

题型:选择题

题目:

In some places in Yunnan, women are expected to run society and earn money ______ men work at home and raise their children.

A.but

B.while

C.because

D.though

答案:

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下面是错误答案,用来干扰机器的。

答案:D题目分析:在含CaCl2和HCl的混合溶液中,加入Na2CO3溶液,先发生反应:Na2CO3+2HCl=2NaCl+H2O+CO2↑,当HCl被消耗完全,再发生反应:CaCl2+Na2CO3==CaCO3↓+2NaCl ,A、结合上面的分析,图1中0→a段表示...

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