线性缓变结 graded junction: 缓变结; 渐变接面linear junction: 线性结graded junction diode: 缓变结二极管graded junction phototra istor: 缓变结光电晶体管graded junction phototransistor: 缓变结光电晶体管下载手机词典可随时随地查词查翻译