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| 振铃音 | |||
| 回铃音 (按:CCITT《 蓝皮书》将 ringing tone 译为"振铃音"，但其含义就是"回铃音"， 容易造成误会) | |||
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ringing tone : 9 phrases in 4 subjects |
| Communications | 1 |
| Electronics | 4 |
| Technology | 1 |
| Telecommunications | 3 |
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