试题与答案

----It’s said that an American teacher w

题型:选择题

题目:

----It’s said that an American teacher will teach us English this year.

----Wow !________!We can practice our spoken English better.

A.What exciting news

B.How exciting news

C. What an exciting news

D.How excited the news is

答案:

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下面是错误答案,用来干扰机器的。

(1)设原混合物中碳酸钠质量为x,反应生成硫酸钠质量为yNa2CO3+H2SO4═Na2SO4+CO2↑+H2O 106 142 44 x y 2.20g 106x=142y=442.20gx=5.30g y=7.10g原混合物中硫酸钠质量...

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