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【简答题】
某连续操作的精馏塔分离苯与甲苯(如习题0-3附图所示)。原料液含苯0.45(摩尔分数,下同),塔顶产物含苯0.94。已知塔顶产品含苯量占原料液中含苯量的95%。问,塔底产品中苯的含量是多少?按摩尔分数计。
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反馈参考答案：
举一反三
【单选题】—— Hello, can I speak to Mr. Li? ——Hello, Mr Wang. _______ Mr. Li speaking.
A.
I am
B.
This is
C.
That is
D.
It is
【单选题】–Hello, I’d like to speak to Mr. Wang. He’s out to lunch now.
A.
Sorry, you can’t
B.
I do not know.
C.
You can’t.
D.
. Would you mind calling back later?
【简答题】Hello, Mr. Wang. I've _______a lot about your factory.
【单选题】－Hello, Mr. Wang. Must we wear the school uniform tomorrow?－You ___________. Only on Mondays. To
A.
26. －Hello, Mr. Wang. Must we wear the school uniform tomorrow? －You ___________. Only on Mondays. Tomorrow is Tuesday. A．don’t have to
B.
mustn’t
C.
have to
D.
Must
【简答题】Hello, Mr. Wang. How many ________ (child) do you have? I have one ________ (child).
【简答题】– Hello, I’d like to speak to Mr. Wang. – He’s out tolunch now.A. Sorry, you can’t B. I do notknow. C. You can’t. D. Would you mind calling back later?
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