About 12 inches wide is the absolute minimum you should consider.
12英寸左右的宽度是你应该考虑的绝对最小尺寸。
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。
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。
应用推荐