There is a great deal of demand in modern electronics, however, for bandpass amplifiers.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.This paper presents a set of all - pole bandpass filter with equal inductances.本文提出一种间隙电容耦合的微带圆盘腔带通滤波器...
Police were periodically patrolling the area.警察定时在这一地区巡逻。Police are patrolling the major approach roads to the stadium.警察正在通往运动场的主要道路上巡逻.I saw women patrolling the streets with rifles on their backs.我看到妇女背着枪在街上巡逻....