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| 定〔顶部〕滑轮 | |||
| 钻井架顶部滑轮组 | |||
| 拱顶石; 拱冠石 | |||
| 顶部滑轮; 吊杆的顶滑车; 起重机顶部滑车组; 天车 | |||
| 定滑轮 | |||
| English thesaurus | |||
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| crn blk | |||
| crown block: 26 phrases in 4 subjects |
| Drilling | 12 |
| Mechanics | 1 |
| Oil / petroleum | 5 |
| Technology | 8 |
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