A.crow bar B.device to force a water tight door against the frame C.heavy steel beam D.wedge
A.velocit in knot B.irection from which it flows C.estimated current D.direction toward which it flows
A.Fire ax B.Flashlight C.rigid helmet D.Fresh air breathing apparatus
A.pin B.stem C.box D.stand
A.a marine chemist B.the Officer in Charge，Marine Inspection C.the Master or person in charge of the ship D.the National Fire Protection Association
A.两盏环照白灯 B.两盏环照黄灯 C.四盏环照白灯 D.四盏环照黄灯
A．是通过波谱分析等方法计算得到的 B．是有经验的观测者目测后外推得到的 C．风浪与涌浪的合成波高 D．风浪高
A.timber or steel rails B.locomotives or boilers C.railway passenger coaches D.motor vehicles
