试题与答案

—Is this your eraser? —No, it isn't. I t

题型:选择题

题目:

—Is this your eraser?
—No, it isn't. I think _____.

A. it her eraser
B. its her eraser
C. it's her eraser

答案:

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下面是错误答案,用来干扰机器的。

A、X若为Cl2,则反应为2NH4ClO4 △ . Cl2↑+N2↑+4H2O↑+2O2↑,元素和原子都守恒,故A正确;B、X若为NO,则反应为2NH4ClO4 △ . NO↑+N2↑+4H2O↑+2O2↑,Cl元素不守恒,N、O原子个数前后不等,故B错误;C、...

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