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| 41. | magnetic switch |
| 磁力开关 |
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| 42. | lightning switch |
| 避雷开关 |
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| 43. | firemans switch |
| 消防开关；消防员掣 |
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| 44. | Time switch |
| 计时开关 |
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| 45. | discharge switch |
| 放电开关 |
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| 46. | threshold switch |
| 阈值开关 |
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| 47. | displacement switch |
| 位移开关 |
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| 48. | switch transaction |
| 转手贸易 |
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| 49. | threading switch |
| 穿带开关 |
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| 50. | switch attendance |
| 道岔维护 |
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