单项选择题
A.buoy B.mark C.beacon D.channel
An officer is always（）（值班）on the bridge .A. on watchB. ...
单项选择题An officer is always（）（值班）on the bridge .
A. on watch B. taking watches C. standing watches D. keep watches
What（）(航速)?A.speedB.lineC.wakeD.route
单项选择题What（）(航速)?
A.speed B.line C.wake D.route
（）（尾） thrust half to part!A.BowB.SternC.TailD.After
单项选择题（）（尾） thrust half to part!
A.Bow B.Stern C.Tail D.After
