Multiple Choice
Unavoidable drainage ditches, culverts, vents, ducts, and other openings should be protected by securely fastened welded-bar grills when they have a cross-sectional area greater than:
A) 10 square inches
B) 48 square inches
C) 64 square inches
D) 96 square inches
E) 04 square inches
Correct Answer:

Verified
Correct Answer:
Verified
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