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GND: This pin is the combined control circuitry and power ground.
该引脚是综合控制电路和电源地。
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The back board is provided with a pin connected electrically with the ground wire.
背板具有引脚，该引脚与接地线电性连接。
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The back board is provided with a pin connected electrically with the ground wire.
背板具有引脚，该引脚与接地线电性连接。
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