キーワード: 即時(shí)(shí)(shí)通訊_______________，企業(yè)(yè)(yè)(yè)(yè)(yè)(yè)溝通_________________，龍笛即時(shí)(shí)(shí)通_________________，移動(dòng)(dòng)(dòng)辦公_____，集成開(kāi)(kāi)(kāi)發(fā)(fā)(fā)(fā)(fā)(fā)(fā)