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| portable rig | |||
| mobile driU; portable drill | |||
| mobile rig; portable drilling rig | |||
| bobtail rig | |||
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轻便钻 机 : 20 phrases in 6 subjects |
| Drilling | 4 |
| Earth sciences | 1 |
| Electronics | 1 |
| Engineering geology | 3 |
| Mechanics | 1 |
| Technology | 10 |
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