单选题The helicopter deck of a ship must be marked with the units identification，appropriate aiming circles，and a continuous line on the perimeter which is（）.A8 inches wideB16 inches wideC24 inches wideD32 inches wide
单选题
The helicopter deck of a ship must be marked with the units identification，appropriate aiming circles，and a continuous line on the perimeter which is（）.
A
8 inches wide
B
16 inches wide
C
24 inches wide
D
32 inches wide
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