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| 不变幅度 | |||
| 等幅 | |||
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| 恒振幅; 不变幅度; 等幅; 恒幅 | |||
| constant amplitude: 28 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Bridge construction | 2 |
| Electronics | 1 |
| Engineering geology | 4 |
| Information technology | 1 |
| Oil / petroleum | 3 |
| Space | 3 |
| Technology | 11 |
| Wind Energy | 1 |
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