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问题 多项选择题

脱氢分馏塔停导热油后（）。

A.提馏塔回流罐液位将升高

B.提馏塔回流罐液位将下降

C.脱氢提馏塔进料必须马上停止

D.脱氢提馏塔进料可以等一会再停止

答案

参考答案：B, D

选择题

．piano is her main focus，she's also great at guitar．

A．Since

B．Once

C．Unless

D．While
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单项选择题

The Chamberlain's Men, in Shakespeare's time, were a remarkable group of people-excellent______who were also business partners and close personal friends.

A．actors

B．students

C．teachers

D．writers
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