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pre-TR
| tube
| pre-TR | |
| mil., air.def. | 前置收发开关 |
| tube | |
| cosmet. | 管，管状物 |
| hydroel.st. | 电子管; 隧道; 地下铁道 |
| isol. | 管材 |
| met. | 管子; 试管; 显像管 |
| steel. | 缩孔 |
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| 前置收发开关 | |||
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pre-TR tube : 2 phrases in 1 subject |
| Air defense | 2 |
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