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| 挂钩开关; 钩键; 开关钩键; 叉簧开关 | |||
| 电话机钩键; 叉簧 | |||
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switch hook : 12 phrases in 5 subjects |
| Automobiles | 1 |
| Electronics | 2 |
| Oil / petroleum | 1 |
| Technology | 1 |
| Telecommunications | 7 |
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