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second harmonic
| tracking
| second harmonic | |
| oil | 第二谐波; 二次谐波 |
| second harmonics | |
| railw. | 二次谐波 |
| tracking | |
| isol. | 电痕化; 起痕 |
| rem.sens. | 定位; 位置; 描绘 |
| |||
| 第二谐波; 二次谐波 | |||
| |||
| 第二谐波; 二次谐波 | |||
| |||
| 二次谐波 | |||
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second harmonic tracking : 36 phrases in 12 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Chemistry | 1 |
| Earth sciences | 1 |
| Electric machinery | 1 |
| Electronics | 17 |
| General | 1 |
| Geophysics | 1 |
| Hydroelectric power stations | 2 |
| Information technology | 1 |
| Polymers | 2 |
| Technology | 7 |
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