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)