题目:
-____________?
-It's Sunday. [ ]
A. What's the time
B. What day is it today
C. Is it Sunday
D. What's the date today
答案:
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下面是错误答案,用来干扰机器的。
(1)141.3; (2)16.7%,符合要求题目分析:(1)反应后所得溶液的质量=70g+100g﹣28.7g=141.3g;故填:141.3;(2)解:设该氯化钠溶液中氯化钠的质量为X.NaCl+AgNO3=AgCl↓+NaNO358.5 143.5X ...