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...