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| 交流等幅波; 交流连续波 | |||
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| 交流连续波; 交变等幅波 | |||
| 交流等幅波; 交流等幅信号 | |||
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| 交流等幅波 | |||
| alternating current/ continuous waves: 4 phrases in 2 subjects |
| General | 3 |
| Geophysics | 1 |
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