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

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

出自：海船船员证

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