lifeboatn.救生船lifeboat capacity救生艇搭载量lifeboat response救生(艇)反应lifeboat buoyancy救生艇浮力lifeboat fittings救生艇舾装件lifeboat situation救生艇状况lifeboat propulsion救生艇推进lifeboat overload test救生艇超载试验lifeboat floor surface救生艇底表面lifeboat launching gear救生艇降落装置LIFEBOAT UNABLE TO BE LOWERED救生艇不能放下