1) derrick purchase
吊杆滑车组
2) derrick purchase
吊杆复滑车组
3) yard-and-stay tackle
联杆吊滑车组
4) davit tackle
吊艇杆滑车
5) derrick head block
吊杆头滑车
6) boom tackle
吊杆滑轮组
参考词条