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【单选题】
当混合物中含有大量的 树脂状杂质 或 不挥发杂质时 ,通常的蒸馏、过滤、萃取等方法都不适用时,可以采用( )将难溶于水的液体有机物进行分离A.
回流
B.
分馏
C.
水蒸汽蒸馏
D.
减压蒸馏
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举一反三
【单选题】Your car wants_________, so you'd better have it done as soon as possible.
A.
repair
B.
repaired
C.
to repair
D.
repairing
【多选题】下列化合物不发生碘仿反应的是：
A.
C6H5CO2CH3
B.
CH3CH2COCH2CH3
C.
C6H5COCH3
D.
CH3COCH2CH3
E.
CH3COCH3
【单选题】Your car wants , so you ’ d better have it done as soon as possible.
A.
repair
B.
repaired
C.
repairing
D.
to repair
【简答题】招标文件不得要求或标明特定的生产供应者以及含有倾向或排斥潜在投标人的内容。（ ）
【单选题】When your family wants to buy or replace a car, a television, or a washing machine, you find the money either from savings or by borrowing from the bank, a hire-purchase company or perhaps a friend. S...
A.
Borrow the money from a building society.
B.
Borrow the money from a bank.
C.
Take money from your savings.
D.
Ask a friend to help you out.
【单选题】Your car wants to ___________, so you'd better have it done as soon as possible.
A.
repair
B.
repaired
C.
to repair
D.
repairing
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