单项选择题
填料塔的有效传质面积为 。
A.塔内填料总表面积
B.塔的截面积
C.塔内润湿的填料表面积
D.不确定
填料塔的有效传质面积为 。
A.塔内填料总表面积
B.塔的截面积
C.塔内润湿的填料表面积
D.不确定
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单项选择题
The long-term average cost of manufacturers is U-shaped because ( )
The long-term average cost of manufacturers is U-shaped because ( )
A.External economic issues
B.External diseconomies
C.Economies of scale and diseconomies of scale
D.The problem of marginal income