（） may be fitted for operating the derrick topping lift (the wire which adjusts the derrick height).<br>A:A capstan<br>B:A hold<br>C:A warp end<br>D:A mooring drum

（） may be fitted for operating the derrick topping lift (the wire which adjusts the derrick height).
A:A capstan
B:A hold
C:A warp end
D:A mooring drum

出自：海船船员证

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