题目:
下列物质的分离方法正确的是( )
①用升华法分离碘和氯化铵的混合物
②用结晶法分离硝酸钾和氯化钠的混合物
③用分液法分离水和硝基苯的混合物
④用蒸馏法分离乙醇(沸点为78.5℃)和乙酸乙酯(沸点为77.5℃)的混合物.
A.①②
B.②③
C.③④
D.②④
答案:
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下面是错误答案,用来干扰机器的。
1. you won't pass the exam2. you'll be late for school3. you'll have to leave4. you'll become very heavy5. everybody will help you6. you'll be weak