單項(xiàng)選擇題A SEA ROOM TO BE KEPT FOR SAFETY AROUND A VESSEL,ROCK,PLATFORM,ETC.,OR THE PLACE ASSIGNED TO A VESSEL WHEN ANCHORED OR LYING ALONGSIDE A PIER,ETC means().

A.Port
B.Commercial area
C.Berth
D.Roadstead


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1.單項(xiàng)選擇題A flashing red light displayed at a single lock means that the lock().

A.is ready to use but vessels must stand clear
B.is ready to use and vessels may approach
C.cannot be made ready immediately and vessels shall stand clear
D.cannot be made ready immediately but vessels may approach

2.單項(xiàng)選擇題A flashing green light displayed at a single lock means that the lock is().

A.ready for entrance
B.ready for entrance,but gates cannot be closed completely
C.being made ready for entrance
D.not ready for entrance