单选题How many adult life jackets are required on board a ship?（）AEnough for 100 percent of the persons allowed on boardBOne for each work station and industrial work siteCEnough for 150 percent of the persons allowed on boardDBoth A and B above
单选题
How many adult life jackets are required on board a ship?（）
A
Enough for 100 percent of the persons allowed on board
B
One for each work station and industrial work site
C
Enough for 150 percent of the persons allowed on board
D
Both A and B above
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