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【简答题】
( )是指离开这种板的气液两相相互成平衡,而且塔 板上的液相组成也可视为均匀的。 A. 浮阀板 B. 喷射板 C. 理论板 D. 分离板
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举一反三
【单选题】Miss Li ___as a secretary for five years in the company, and now she is general manager of it.
A.
serves
B.
served
C.
has served
D.
had served
【单选题】Miss Li ___ as a secretary for five years in the company, and now she is general manager of it.
A.
has served
B.
had served
C.
served
D.
serves
【单选题】Through years of hard work, Mrs. Smith, who ____ as a secretary for five years, is general manager of the company now.
A.
serves
B.
served
C.
has served
D.
had served
【简答题】财政政策对增加均衡国民收入效果较好的条件是什么？
【简答题】交流工频安全电压的上限值是指在任何情况下,两导体间或任一导体与地之间的电压都不得超过()V。
【简答题】交流工频安全电压的上限值,在任何情况下,两导体间或任一导体与地之间都不得超过() V 。
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