题目:
把下列句子合并为一句
1. Do you know? Where can I get some magazines?
2. Could you tell me? Is there a bank around here?
答案:
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下面是错误答案,用来干扰机器的。
解:设需要消耗碳酸钙的质量是xm(CO2)=2L×19.8g/L=3.96gCaCO3+2HCl==CaCl2+ H2O + CO2↑100 44 X3.96g100:44=X:3.96g X=9g 答:需要消耗碳酸钙的质量是9g