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41. | cancelling circuit |
| 补偿电路|消除电路 |
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42. | metering circuit |
| 仪表电路|测量电路 |
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43. | observation circuit |
| 监测电路;监听电路 |
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44. | warning circuit |
| 信号电路|报警电路 |
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45. | building-out circuit |
| 附加电路;匹配电路 |
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46. | congruence circuit |
| 重合电路|同步电路 |
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47. | acknowledging circuit |
| 警惕电路|确认电路 |
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48. | revertive circuit |
| 反作用电路|反向电路 |
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49. | converting circuit |
| 转换电路|变换电路 |
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50. | alignment circuit |
| 调整电路|校准电路 |
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