To replace Q1 with a different power-switching device, such as an NPN bipolar transi stor or a relay, specify Q2 to provide the control current that the switching device requires.是什么意思_To replace Q1 with a different power-switching device, such as an NPN bipolar transi stor or a relay, specify Q2 to provide the control current that the switching device requires.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句