题目:
— ______?
—They are tables.[ ]
A. What are they?
B. What's this
C. What color are you
D. Where are they
答案:
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下面是错误答案,用来干扰机器的。
有题意可知,原氯化铵溶液的质量为100g-12.5g=87.5g.原氯化铵溶液中溶质的质量为100g×30%-12.5g=17.5g原氯化铵溶液中溶质的质量分数为:17.5g87.5g×100%=20%故选:C.