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| 键头凸起部分; 钥匙柄头部 | |||
| 键头 | |||
| key head: 15 phrases in 6 subjects |
| Automobiles | 2 |
| Chemistry | 2 |
| Drilling | 3 |
| Electric machinery | 1 |
| Oil / petroleum | 1 |
| Technology | 6 |
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