题目

_____ his father came back from work_____ his homework.A.Not until; he did      B.It wasn't until; when he didC.It was until; that he didn't do        D.It wasn't until; that he did 答案:D20℃时,向甲烧杯中加入25g水和25g固体固体A,向乙烧杯中加入25g水和25g固体B(A、B两种物质均不与水反应).充分搅拌后,甲烧杯中固体剩余,乙烧杯中固体全部溶解.请回答下列问题:(1)20℃时,甲烧杯中溶液是______(填“饱和”或“不饱和”溶液;一定能使甲烧杯中的固体A继续溶解的方法是______.(2)20℃时,A的溶解度______(填“大于”、“小于”或“等于”)B的溶解度.(3)20℃时,为判断乙烧杯中溶液是否饱和,除采用实验的方法外,还可以利用题中已有数据和______数据来判断.
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