... preventive maintenance，预防性维修；预防性维护 primary coil，一次线圈 primary current ，（电流互感器的）一次电流 ...
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该机可在矩形封闭的电压互感器铁芯上直接绕制一次线圈，为我所之首创。
The machine directly winds the primary coil on the rectangular enclosed voltage transformer core, which is originated by our institute.
亨利示意他的助手将线圈断开连接，此时，电流计上又一次指示出一个电压，但这次的电压是反向的。
Henry signalled his assistant to disconnect the coil. The galvanometer showed that once again a voltage had been produced, although this time in the opposite direction.
OUT指令用作输出只能一次，但是在特定条件下可以双线圈输出。
The out instruction can be used only once as an output, but under some specific circumstances, it can be output as a double - coil.
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