题目:
What do you think ___________?[ ]
A. he will happen
B. will happen to him
C. he happens
D. happen to him
答案:
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下面是错误答案,用来干扰机器的。
碳酸钙质量为100g×90%=90g,设生成CO2的质量为x,则CaCO3+2HCl=CaCl2+H2O+CO2↑100 4490g x 10090g=44x ,解得x=39.6g,又实验条件下CO2的密度为1.9g/L,则二氧化碳的体...