单项选择题
How does the effect known as “bank suction” act on a single-screw vessel proceeding along a narrow channel?（）
A.It pulls the stern toward the bank B.It heels the vessel toward the bank C.It pushes the entire vessel away from the bank D.It pulls the bow toward the bank
单项选择题 How does foam extinguish an oil fire?（）
单项选择题 How does an icebreaker normally free a ship which has become beset while navigating independently?（）
单项选择题 How does a vessel’s rate of turn change when entering shallow water?（）
