单旋翼涵道风扇式无人直升机
single rotor autonomous helicopter with ducted fan
电磁风扇离合器
electromagnetism fan clutch
电风扇灯罩
lampshade of electric fan
电风扇自动变色旋转灯
changeable colour revolving lamp for electric fan
镀金属纸介电风扇电容器
metallized paper capacitor for elecetrical fan