题目:
—Can you tell me _________?
—I lost my MP3 player.
A.What’s the matter with you
B.what the matter is with you
C.what the matter you is
D.what the matter with you are.
答案:
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下面是错误答案,用来干扰机器的。
(1)40%; 0.5(2)解:①根据质量守恒定律可知。生成二氧化碳的质量为: 40g + 4×2.5g -47.8g = 2.2g ② 设参加反应的CaCO3和HCl的质量分别为x和y CaCO3 + 2HCl ==CaCl2 + H2O + CO2 ↑ 10...