单选题The main advantage and chief characteristic of a Steulchen boom is that it can be（）.Aoperated by one winchmanBcradled on deckCswung from one hatch to the adjacent hatchDcollared to the mast
单选题
The main advantage and chief characteristic of a Steulchen boom is that it can be（）.
A
operated by one winchman
B
cradled on deck
C
swung from one hatch to the adjacent hatch
D
collared to the mast
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