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)