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單項(xiàng)選擇題

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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單項(xiàng)選擇題

Vessels must （） pilot at waiting anchorage．

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

單項(xiàng)選擇題

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