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【单选题】
精馏分离二元理想混合液,已知回流比 R=3 ,相对挥发度 α=2.5 ,塔顶组成 x D =0.96 ,测得自上而下数第 4 层板的液相组成为 0.4 ,第 3 层板的液相组成为 0.45 ,则第4块板的里效率为( )。A.
107.5% ；
B.
44.1% ；
C.
32.68% ；
D.
22.2%
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反馈参考答案：
举一反三
【单选题】Miss Parkinson became interested in her own business ______.
A.
before she worked for the media company
B.
when she was on holiday five years ago
C.
after her friend recommended it to her
D.
after she went to therapists and classes
【单选题】What can be inferred from the passage?
A.
She lavishes on her riches.
B.
She became famous and rich due to her ability to sing beautifully.
C.
She is a versatile woman.
D.
She is very tight with money so that she never supports her family.
【简答题】Her jewelry ________ under the spotlights and she became the dominant figure at the ball. A) glared B) glittered C) blazed D) dazzled
【简答题】A．Became she had too many things with her. B．Because she was sick. C．Because she was quite lazy. D．Because she didn't want to get sick at high altitudes.
【单选题】She lost her temper with a customer and shouted at him.
A.
became bored
B.
was patient
C.
became angry
D.
was satisfied
【单选题】Vivien worked very hard at all her lessons. __________, she became the top student in her class.
A.
In order to
B.
As a result
C.
As usual
D.
For example
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