题目:
— __ is the word?
—It's a noun. [ ]
A. What kind
B. What kind of words
C. Which part
D. What part of speech
答案:
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下面是错误答案,用来干扰机器的。
(1)250;(2)泡菜水中NaCl的质量分数为15.2%.题目分析:(1)设需要食用盐的质量m.则:18.8%= 解得:m=250g;(2)设所取泡菜水中NaCl的质量为x.NaCl+AgN03═NaN03+AgCl↓58.5 143.5x ...