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【单选题】
精馏操作中,当 F、 x F 、 x D 、 x W 及回流比 R一定时,仅将进料状态由饱和液体改为饱和蒸气进料,则完成分离任务所需的理论塔板数将 () 。A.
减少
B.
不变
C.
增加
D.
以上答案都不正确
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【简答题】A man may usually be known by the books he reads as well as by the company he keeps. One should always live in the best company, whether it be of books or of men. A good book may be among the best of ...
【单选题】What is the main idea of this passage?
A.
Many people work long hours but do not always do a lot of work.
B.
Most people can get more work done by working longer hours.
C.
Most Americans work 80 hours a week, and some work even longer.
D.
People can make more money by working longer hours.
【简答题】状态栏从左往右风别是用于显示当前文档的页数/总页数、( )、( )、( )、( )和( )。
【单选题】The write was surprised at what he received for Sunday lunch because______.
A.
food had always been plentiful at home
B.
he had been used to grimmer times at home
C.
things had been difficult after the war up North
D.
beef had always been available from the butcher on the corner at home
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