The main advantage and chief characteristic of a Steulchen boom is that it can be（）.<br>A:operated by one winchman<br>B:cradled on deck<br>C:swung from one hatch to the adjacent hatch<br>D:collared to the mast

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

出自：海船船员证

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