derrick block
基本解释
- [经济学]提升滑轮
英汉例句
- The derrick man, positioned at the crown block, is to advise the driller when the snake is coming through the crown sheave.
井架工看守在天车上，当蛇皮接绳器到达天车时，通知司钻。
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双语例句
词组短语
- 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
短语
专业释义
- 提升滑轮