Which part of a conventional cargo gear rig provides for vertical control and positioning of a boom（）.<br>A:Cargo whip<br>B:Gooseneck fitting<br>C:Spider band<br>D:Topping lift

Which part of a conventional cargo gear rig provides for vertical control and positioning of a boom（）.
A:Cargo whip
B:Gooseneck fitting
C:Spider band
D:Topping lift

出自：海船船员证

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