字典網>> 英漢字典>> D開頭詞條>>direction cosine的意思 漢英字典direction cosine中文翻譯：【電】 方向餘弦字典網英文字典相關詞條：directional homing directional comparision relay directional overcurrent relay directional coupler directional emitter directional beam direction-finder directional hydrophone directional separation filter directional filter