开关电源电晶体 power transistor switching unit: 功率晶体管开关单元switching transistor: 开关晶体管power transistor: 功率晶体管circuit transistor current switching: 晶体管电流开关电路inertia of transistor switching circuit: 晶体管开关器的惰性下载手机词典可随时随地查词查翻译