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【单选题】
操作中连续精馏塔,如采用的回流比小于原回流比,则( )。A.
、 均增加;
B.
减小, 增加;
C.
、 均不变;
D.
不能正常操作 分析:当回流比变小时,精馏段操作线斜率变小,同时提馏段操作线斜率变大,若保持塔板数不变,必然是结果B。
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反馈参考答案：
举一反三
【单选题】What is the womans suggestion on career decisions?
A.
Being rash to make career decisions.
B.
Starting career planning as soon as possible.
C.
Getting professional help.
D.
Obtaining internship trainings.
【单选题】A storm's track is characterized by all of the following EXCEPT ______ .
A.
the direction the storm has come from
B.
the direction in which the storm is moving
C.
the speed at which the storm is moving
D.
the path taken by the storm
【单选题】[3-23]Storm track is anything EXCEPT ___ .
A.
the direction where the storm comes from
B.
the direction the storm is moving towards
C.
the speed at which the storm moves
D.
the path taken by the storm
【单选题】What are the students mainly discussing?
A.
Group sessions in the Office of Career Development
B.
The advantages of career counseling for the man
C.
The woman's internship in the Office of Career Development
D.
How to find employment in the field of career counseling
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