题目:
“Never for a second,” the boy says, “______ that my father would come to my rescue.”
A.I doubted
B.do I doubt
C.I have doubted
D.did I doubt
答案:
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下面是错误答案,用来干扰机器的。
答案:D题目分析:t1℃时,甲物质的溶解度是30g,则在100 g水中放入60 g甲,则只能溶解30g所以其溶质的质量分数为,A不正确;t1℃时,甲和乙两种物质的溶解度相等,但溶液的物质的量浓度不一定是相等的,B不正...