单选题Which part of a conventional cargo gear rig provides for vertical control and positioning of a boom（）.ACargo whipBGooseneck fittingCSpider bandDTopping lift
单选题
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
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