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【单选题】
蒸馏操作是利用各组分（）差异或各组分蒸汽压的差异使它们得到分离。A.
溶解度
B.
沸点
C.
熔点
D.
浓度
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反馈参考答案：
举一反三
【简答题】Some people have travelled to Canada while others may have just heard of it . As is known to all, the Canadian red and white maple leaf flag is officially called The National Flag of Canada. The Canad...
【简答题】The paper cup is ______________ the electric water-heater.
【单选题】You ______________ get the boiled water by yourself from the electric water-heater at the end of the carriage.
A.
may
B.
must
C.
have to
D.
can
【简答题】Electric water heater is over there at the end of the ______________.
【单选题】The ______cup is beside the electric water-heater.
A.
metal
B.
paper
C.
plastic
D.
no
【单选题】The paper cup is ______________ the electric water-heater.
A.
near
B.
beside
C.
opposite
D.
by
【判断题】As some people have quite a lot of working experiences, it is not easy for them to pick out the job they badly want.
A.
正确
B.
错误
【简答题】You ______________ get the boiled water by yourself from the electric water-heater at the end of the carriage.
【简答题】Some people think that as more and more people have televisions in their homes, fewer and fewer people will buy books and newspapers. Why read an article in the newspaper, when the TV news can bring y...
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