单词	环型的
释义	同螺旋状的--环型的
随便看	direction equation direction field direction filtering direction finder direction finder-- adcock direction finder; adcock direction finder bearing indicator direction finder (df) direction finder {= df} direction finder--df direction finder{=df} direction finder-- radio direction finder; radio direction finders direction finder sensitivity direction finder，df direction finding direction-finding direction-finding antenna direction finding {= df direction finding--df direction finding {= df-- df-ing} direction finding {= df; df-ing} direction-finding indicator direction finding penetration and approach procedures