All persons or vessels within the lock area，including the lock approach channels，come under the authority of the（）.<br>A:dockmaster<br>B:dock captain<br>C:lockmaster<br>D:lock foreman

All persons or vessels within the lock area，including the lock approach channels，come under the authority of the（）.
A:dockmaster
B:dock captain
C:lockmaster
D:lock foreman

出自：海船船员证

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