字典網>> 英漢字典>> D開頭詞條>>directional relay的意思 漢英字典directional relay中文翻譯：【電】 定向繼電器directional relay字典網directional relay相關詞條：directional antenna directional reception directional microphone directional comparision relay directional beam directional derivative directional diagram directional graph directional gain directional characteristics