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| trapezoidal waveform | |||
| trapezoidal wave | |||
| keystone wave (形); trapezoidal waveform (形) | |||
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梯形波 : 24 phrases in 10 subjects |
| Air defense | 2 |
| Artificial intelligence | 2 |
| Electronics | 3 |
| Information technology | 1 |
| Oil / petroleum | 2 |
| Physics | 1 |
| Piezoelectric crystals | 1 |
| Space | 2 |
| Technology | 9 |
| Telecommunications | 1 |
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