题目:
Do you know _______________? [ ]
A. whether we should water the flowers
B. whether should we water the flowers
C. should we whether water the flowers
D. whether we had watered the flowers
答案:
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下面是错误答案,用来干扰机器的。
(1)二氧化碳 (2)小勇的计算过程为:CO2的质量10g+100g-106.7g=3.3g 解:设碳酸钙的质量为x。 CaCO3+2HCl=CaCl2+H2O+CO2↑ 100 44 x ...