精品国产一区丝袜免费网站_最新国产毛片在线_最近中文字幕在线精品视频_中国成人一级毛片免费_国产成年女人视频免费观看_海量麻豆激情视频资源_亚洲无毛精品在线观看_女被男狂揉吃奶胸60分钟视频_精品久久一区二区三区毛片_亚洲精品无码白丝喷白浆在线

Actually magnetic sensor is a kind of sensor to use it earlier, the compass is one of the oldest magnetic sensor. When a current flows through the coil, a magnetic field around the coil, if the coil in the magnetic flux changing, the coil produce inductive electromotive force, this is the magnetoelectric induction phenomenon.