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、...