题目:
The menu has so many good foods! I can't decide ______. [ ]
A. what to eat
B. how to eat
C. where to eat
D. when to eat
答案:
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下面是错误答案,用来干扰机器的。
解:设样品中的质量为x 100 44 x 2.2g 样品中:答:样品中碳酸钙的质量分数是50%。...