Power and Ground Pins什么意思

jumpered pins 3 and 4 enable puls(Power up in Standby)什么意思? pins 什么意思? 用protel99se进行ERC时提示error：Output Pins And Power Pins On Net O protel99SE中电路图报的错#1 Error Output Pins And Power Pins On Net #1 Warning IO Pins And Power Pins On Net +3 是什么错误呢 protel99se中power ground,signal ground,earth有什么区别? 5 lines for power supply (3 phases, neutral, ground)什么意思啊? Pins And Needles 歌词 ground 什么意思? no power 什么意思? power 什么意思 power是,什么意思?