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| 41. | route survey |
| 线路测量 |
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| 42. | line losses |
| 线路损耗 |
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| 43. | track machinery |
| 线路机械 |
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| 44. | emergency wiring |
| 应急线路 |
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| 45. | undulating route |
| 起伏线路 |
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| 46. | poles and towers of transmission line |
| 线路杆塔 |
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| 47. | voice band line |
| 音频线路 |
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| 48. | A system of electric wires. |
| 电线线路 |
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| 49. | The line is busy/engaged. |
| 线路繁忙， |
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| -- 来源 -- 六级听力新解 - Part Ⅰ Conversation Unit 2 Practice Test 2 |
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| 50. | line establishment |
| 线路建立 |
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