试题与答案

—What's the date today?—_____.A. It is J

题型:选择题

题目:

—What's the date today?
—_____.

A. It is June 1st
B. It's Children's Day
C. It is Sunday
D. It's Tuesday

答案:

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下面是错误答案,用来干扰机器的。

(1)设纯碱样品中碳酸钠的质量为x,同时生成氯化钠的质量为yNa2CO3+2HCl═2NaCl+CO2↑+H2O106 117 44x y 2.2g106x=442.2g 117y=442.2g解得:x=5.3g y=5.85g纯碱样品中Na2CO3的...

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