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__________，集成開發(fā)(fā)(fā)(fā)(fā)(fā)