The lifting capacity of this chain hoist (hydraulic jack, screw jack) is 5 tons.
这个倒链（油压千斤顶、螺旋千斤顶）的起重能力为 5 吨。
2
The lifting capacity of this chain hoist ( hydraulic jack , screw jack ) is 5tons.
这个吊链（油压千斤顶、螺旋千斤顶）的起重能力为5吨。
3
The velocity constraint subspace of each branch chain was obtained by means of solving the screw system of each branch chain of 3-PTT parallel mechanism.