We shall take the typical emitter - to - base resistance as about 250 ohms.我们取发射极基极电阻的典型值为250欧姆左右.We have been considering the transistor with a current fed into the emitter.我们所研究的晶体管都是把电流馈入发射极.The base region is always ...
Particles deposited in the alveoli are immediately subjected to coating by surface active lipid materials.当粒子沉淀到肺泡中时,立刻会遭到表面活性的脂质物质的复盖.Surfactant is the name given to the lipid secretions that lie in the alveoli.表面作用剂是指肺...
He heard tires squeal as the car braked to avoid a collision.为避免相撞而刹车时，他听到了轮胎与地面刺耳的摩擦声。The car's tires bit loudly on the rutted snow in the street.汽车轮子碾入街道上布满车辙的雪里，发出很大的声响。She heard the crunch of tires on the gravel...