n.半徑，有效航程，范圍，界限 ‖ radius drill定距射門(mén)練習(xí) radius of action滑降彎轉(zhuǎn)半徑 radius of burst爆炸半徑 radius of damage破壞半徑 radius of flight飛行半徑 radius of gyration回轉(zhuǎn)半徑 radius of influence影響半徑 radius of operation活動(dòng)半徑 radius of rotation轉(zhuǎn)動(dòng)半徑 radius of safety安全半徑 radius of visibility能見(jiàn)半徑