测向仪与指向标

测向仪与指向标，测向仪与指向标,cexiangyi yu zhixiangbiao，测向,指向,cexiangyi,yu,zhixiangbiao，[拼音]：cexiangyi yu zhixiangbiao[外文]：direction finder and radiobeacon近程和中程海上导航用的无线电测向设备。最早的测向仪出现于2...