derrick block
短语词组
- derrick head block 吊杆头滑车
- derrick heel block 吊杆底导向滑车;吊杆座滑车
- derrick k block 提升滑轮
- derrick head span block 吊杆头跨绳滑车
- derrick head purchase block 上吊货滑车
- derrick cargo lead block 吊货索导向滑车
- derrick head cargo block 吊杆头起货滑车;吊杆头起重滑车;上吊货滑车
- derrick head shipment block 吊杆头起货滑车
- cargo derrick heel lead block 吊货杆座导索滑车 返回 derrick block