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