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