题目

对于混合物的分离或提纯,常采用的方法有:①过滤、②蒸发、③蒸馏、④萃取、⑤加热分解等.下列各组混和物的分离或提纯应采用什么方法?(填序号) (1) 提取碘水中的碘;         (2) 除去食盐溶液中的水; (3) 淡化海水;              (4) KCl中含有KClO3.根据对话内容,在每小题的空白处境入适当的句子,使对话意思完整。Dick:Excuse me,Lucy. Have you got a dictionary?Lucy:Sorry,I haven, You may ask Meimei. 1__________________..Dick:Excuse me, Meimei. Have you got a dictionary?Meimei:Yes. 2__________________.Dick:Thank you. I'11 give it back 800n. By the way, tomorrow is my birthday.3__________________?Meimei: Yes, I'd love to.4__________________?Dick: About seven o' clock. Meimei: I'll try to be there on time. but 5__________________.Dick: It doesn't matter. Work must come first.
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