The main hoist winch and a system of elevators lift 1,250 tons of pipes and machinery through the 72 inches wide hole at the bottom of the boat.
主起吊绞车和升降机系统可通过船底72英尺宽的洞，提升1，250吨重的管道和机械。
2
This paper gives theory basis to the exploitation of the wave compensation boat-lifting winch.
这为波浪补偿起艇绞车的开发提供了理论支持。
3
Then it analyses the wave's movement and technical quota of boat-lifting device at abominable sea state which supply the foundation to the following design of wave-compensation boat-lifting winch.