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)(kāi)發(fā)(fā)(fā)(fā)(fā)(fā)(fā)