然而近代电子学对调谐的频率范围很宽的带通放大器提出很多要求.There is a great deal of demand in modern electronics, however, for bandpass amplifiers.滤波器. 可指定高通 、 低通 、 带通 或带阻滤波器.Filter. High - pass, low - pass, band - pass , or band - stop filter can b...
National isolation can only cause economic and cultural impoverishment.锁国只会导致经济和文化上的困厄。Punishment cannot be discussed in isolation from social theory.不能脱离社会理论孤立地讨论惩罚。Digital Logic Isolation. Line Receiver. Power Supply C...
Liver and kidney are particularly rich in vitamin A.肝脏和肾脏富含维生素A。He had kidney cancer, with secondary tumours in the brain and lungs.他患有肾癌，还有脑部和肺部的继发性肿瘤。"Medicare" is available to victims of advanced kidney disease.老年医疗保险...