单项选择题
A.Shift weight to the bow B.Shift weight to the center of the boat C.Shift weight to the stern D.Throw excess weight overboard
A SEA ROOM TO BE KEPT FOR SAFETY AROUND A VESSEL，ROCK，P...
单项选择题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
A flashing red light displayed at a single lock means t...
单项选择题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
A flashing green light displayed at a single lock means...
单项选择题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
