It also describes the principle of thickness measure, circuit and connected circuit of major control unit.
详述了测厚原理、电路及主控单元接口电路。
Consider a simple circuit that consists of one digital input connected to a digital output.
假设,一个最简单的电路,只有一个数字输出端连接一个数字输入端。
Because you need both a voltage source and a ground in order to create a complete circuit, you need to have a sourcing input or output connected to a sinking output or input.
因为在一个完整的电路中必须有一对电源和地。
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