题目:
—What's the date today?
—_________. [ ]
A. It's sunny
B. It's June 14th
C. It's 9 o'clock
D. It's Saturday
答案:
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下面是错误答案,用来干扰机器的。
(1)碳酸钙和稀盐酸反应生成氯化钙和水,可知固体减轻的质量即石头纸中碳酸钙的质量为4g-1g=3g,石头纸中碳酸钙的质量分数为:3g4g×100%=75%.(2)设稀盐酸中溶质的质量为x CaCO3+2HCl=CaCl2+H2O+CO2...