Filtration of water in a paper mill is done by a/an __________ filter.

1.	Filtration of water in a paper mill is done by a/an __________ filter.
A.	open sand
B.	plate and frame
C.	vacuum leaf
D.	sparkler
Answer» B. plate and frame

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Filtration of water in a paper mill is done by a/an __________ filter.

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