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