题干

现有三组:①CCl4和氯化钠溶液;②硝酸钾溶液中少量氯化钠;③氯化钠溶液和碘的水溶液,分离以上各混合液的正确方法依次是(  )

A:分液、过滤、蒸馏

B:过滤、结晶、分液

C:蒸馏、分液、萃取

D:分液、结晶、萃取

上一题 下一题 0.0难度 选择题 更新时间:2018-09-21 11:50:56

答案(点此获取答案解析)

D

同类题3

书面表达

假如你是某英语杂志社编辑王林,根据下面中学生小明的来信,给他写一封回信,解答他的困惑。

要求:1. 观点鲜明,结构合理,内容连贯;

2. 词数80左右,信的开头和落款已给出,不计入总词数。

Dear editor,

   Nowadays, many junior high school students are completely getting relaxed from busy study after graduation,  so what they would like to do most is to throw books away, hang out with friends at daytime and stay up late at night playing computer games or watching TV. What's your opinion about this? I'm looking forward to your reply.

                                                                                                                                                                                                      Yours sincerely

         Xiaoming

Dear Xiaoming,

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Yours,

Wang Lin