单项选择题 A situation has occurred where it becomes necessary for you to be towed. What action should be taken to prevent your vessel from yawing?（）.

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（）.