2-Core Socket 两芯电源插座
Use 220v AC and three-core socket with good grounding to avoid power leakage.
使用220v交流电源，必须带有接地的三芯插座，以防漏电。
By contrast, PC keyboards are not only cheap, stable and reliable but also a kind of coded keyboard which can be scanned and send the scan code via a standard 5 core socket automatically.
PC用键盘则恰恰相反，不但价格便宜，稳定可靠，而且是编码键盘，可自动扫描键盘并通过键盘用标准5芯插口发送按键的扫描码。
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