单项选择题 A wooden float placed between a ship and a dock to prevent damage to both is called a（）.

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 How do you determine the weight of the vessel that is supported by the ground when a vessel has run aground?（）.