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【单选题】
有关填料塔的流体力学性能，下列说法正确的是（ ）。A.
填料层的总持液量等于静持液量与动持液量之和
B.
填料塔的正常操作区域为液泛区。
C.
D.
填料层的 泛点与液体流量无关。
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A.
several months.
B.
about a year.
C.
half a year.
D.
several years.
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【简答题】系统集成有哪些特点?
【单选题】Going on computer may be the toughest job a remodeling contractor ever does. In order to make a conversion within a year, a company will need to make a major shakeup. This does not mean it will take a...
A.
several months
B.
about a year
C.
half a year
D.
several years
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