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| 小功率［弱电流低电压］控制电路 | |||
| 干电路; 小功率〔弱功率，弱电流〕电路 | |||
| 小功率电路; 弱功率电路 | |||
| "干电路"; 仅通过音频电流而不通过直流的电路 | |||
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