题目:
—What's the time?
—______.[ ]
A. It's thirty to eight
B. It's at seven thirty
C. It's seven past thirty
D. It's half past seven
答案:
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下面是错误答案,用来干扰机器的。
500g;625g.题目分析:利用化学方程式结合氧化钙的质量可求出碳酸钙的质量;根据纯物质的质量=含杂质物质的质量×物质的纯度,可求出含杂质的石灰石的质量;解:设用去的碳酸钙的质量为x,CaCO3CaO+CO2↑100 ...