单项选择题

When a pilot is on board to pilot the vessel the Letter （） must be hoisted．

A.G
B.H
C.B
D.N

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单项选择题

Vessels must （） pilot at waiting anchorage．

A.wait
B.wait for
C.be waited
D.be waited for

单项选择题

There shall be two principal （） through the harbor for the passage of vessels of over 60 tons burden．

A.straits
B.channels
C.canals
D.roadsteads

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