单项选择题
A look-out at the bow sights an object on your port side. How many bell strokes should he sound? （）
A.One B.Two C.Three D.Four
单项选择题 A helmsman receives the command Right 15 degrees rudder. The helmsman’s IMMEDIATE reply should be（）.
单项选择题 “How do you read?” “I read you four”（）.
单项选择题 “Full speed ahead” and “Full speed astern” are（）given by the officers or the pilots.
