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【判断题】
完成一个精馏操作的两个必要条件是塔顶液相回流和塔底上升蒸气。A.
正确
B.
错误
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举一反三
【单选题】In my hometown, there is always a harvest supper for the farmers after all the wheat ____ cut.
A.
will have been
B.
was
C.
will be
D.
has been
【简答题】三凹征指 、 、 的凹陷。
【单选题】Because agriculture is so important to a nation's well-being, governments have always been concerned with it. For example, the United States and Canada have long produced surpluses that complicate the...
A.
they throw the country into great disorder
B.
they entail more expenditure on the part of the government
C.
they usually involve direct governmental support price
D.
the government has to set up special pricing systems
【单选题】【2015·重庆】In my hometown, there is always a harvest supper for the farmers after all the wheat____ cut.
A.
will have been
B.
will be
C.
was
D.
has been
【单选题】In my hometown, there is always a harvest supper for the farmers after all the wheat____ cut.
A.
will have been
B.
will be
C.
was
D.
has been
【单选题】Farmers have always had a particular interest in the weather, because it ( ) their work.
A.
accelerates
B.
effects
C.
affects
D.
exerts
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