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| 鼓形传动机构 | |||
| 卷筒传动; 磁鼓驱动器; 磁鼓驱动 | |||
| 磁鼓驱动机构; 滚筒驱动机构 | |||
| drum drive: 10 phrases in 5 subjects |
| Drilling | 1 |
| Electronics | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 1 |
| Technology | 4 |
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