arco以弓拉arcn.弧；弧形物vi.形成电弧；按弧形轨迹行进arc-dropn.电弧降压Arcentales阿森塔莱斯arc cosinen.反余弦arc-gear圆弧齿轮Arc bottom弧底arcapillin茵陈黄酮Arcesilaus阿凯西劳斯arc carbon电弧碳精棒arctigeninn.牛蒡配基arc crater电弧陷口,弧坑