起初我们着手研究的是看起来似乎最简单和最明显的滤波器.We started with what seemed the most simple and obvious filter.在适当条件下,多层膜还可作滤波器.Under appropriate conditions a multilayer may also be employed as a filter.这个信号送到滤波器 - 放大器,它是由变压器耦合到视频检波器的.The si...
雨水过多是亚马逊河与刚果河流域赤道地区的大问题.Too much rain is the problem of the equatorial lands in the Amazon and Congo basins.亚马孙河流域已有40万平方公里的森林遭到滥伐。400,000 square kilometres of the Amazon basin have already been deforested.尼罗河流域一年四季气候温和。...
Add the prawns and squid and cook for 2 minutes.放入对虾和鱿鱼，烹炒2分钟。The seals feed mainly on fish and squid.海豹主要以鱼和乌贼为食.SQUID, and points out the application of Josephson effect to accurate measure.SQUID 测量弱磁场的基本原理并指出了约瑟夫逊效应在精...