单选题When the union purchase derrick is operated, one derrick is positioned over the quayside and the other almost vertically over the （）.AdockBholdCpedestalDmachinery space
单选题
When the union purchase derrick is operated, one derrick is positioned over the quayside and the other almost vertically over the （）.
A
dock
B
hold
C
pedestal
D
machinery space
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