In sieve 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. 5 to 10

C. 2.5 to 4.0

D. 10 to 15

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