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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.

0.5 to 1.5
2.5 to 4.0
5 to 10
10 to 15

Correct Answer: 2.5 to 4.0

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