Arcak阿尔贾克arcn.弧；弧形物vi.形成电弧；按弧形轨迹行进arc-overvohage suppressor消弧装置arc length increment method弧长增量法arc segments ceramic magnet磁瓦Arcuatopterus linearifoliusn.条叶弓翅芹arc pilot tunnel excavation弧形导坑开挖arc-shaped grinding wheel圆弧形砂轮arcus alveolaris mandibulae下颌牙槽弓arcus occipito-parietalis[医] 枕顶弓arc interpolated arithmetic圆弧插补算法Arcangelisia loureiri Diels古山龙