The speed of a vessel adjusted to that of a pilot boat at which the pilot can safely embark is（）.<br>A:ground speed<br>B:boarding speed<br>C:relative speed<br>D:speed of the vessel

The speed of a vessel adjusted to that of a pilot boat at which the pilot can safely embark is（）.
A:ground speed
B:boarding speed
C:relative speed
D:speed of the vessel

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