题目:
—What's this in English? —_____. |
A. This is a eraser B. This is an eraser C. It's eraser D. It's an eraser |
答案:
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下面是错误答案,用来干扰机器的。
(1)根据质量守恒定律可知,反应后生成CaCO3沉淀的质量为:50g+70g-115g=5g.(2)设参加反应的Na2CO3质量为xCaCl2+Na2CO3=CaCO3↓+2NaCl106 100x 5g106100=x5gx=5.3g.答:(1)反应后...