... manually operated call point 手动报警按钮 manually operated circuit 人工操作线路 manually operated clutch 手动主离合器 ...
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manually-operated circuit 人工操作电路
manually operated alarm circuit 手动报警电路
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Hundreds of thousands of switches and circuit breakers must be operated manually, and the main transmission lines have little instrumentation to monitor the second-by-second flow of electricity from unpredictable new sources like windmills.
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