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chemical engineering process equipment and plant design
1. In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area.
(A): 0.5 to 1.5
(B): 10 to 15
(C): 2.5 to 4.0
(D): 5 to 10
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