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

Question: 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: Option A

Explanation:

No answer description available for this question.