A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.

A natural draft cooling tower is filled with wooden grids, which cover

1.	A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.
A.	10-15
B.	30-40
C.	70-80
D.	90-100
Answer» B. 30-40

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A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.

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