实际上，这就是把负电阻接入电路，使电路的总电阻为零。
In effect, a negative resistance is inserted in the circuit so that its total resistance is zero.
设计了一台多阴极的金属蒸气真空弧离子源，它有18个阴极，任一阴极都能在真空状态下被迅速接入电路工作。
A multi-cathode metal vapor vacuum arc (WEVVA) ion source has been designed. It contains an array of 18 cathodes, any of which can be switched into operation rapidly while under vacuum.
采样模拟信号，转化成数字信号。2）接口的连接问题。3）LED显示器如何接入电路。4） 如何进行显示控制。
Sampling analog signals into digital signals. 2) interface connectivity problems. 3) LED display to access the circuit. 4) How to display control.
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