题目:
—When did you lose your dog?
—_____.
A. Three days later
B. Three days ago
C. In three days
D. For three days
答案:
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下面是错误答案,用来干扰机器的。
设稀盐酸中氯化氢的质量为X,参加反应的碳酸钙的质量为Y由题意可知,反应后生产二氧化碳的质量为:12g+100g-107.6g═4.4gCaCO3+2HCl═CaCl2+H2O+CO2↑ 100 73 44 Y X 4.4g 10...