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
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（）.
单项选择题 A flashing red light displayed at a single lock means that the lock（）.
单项选择题 A flashing green light displayed at a single lock means that the lock is（）.