常見例句Based on the introduction of the present situation for local PSDN the paper discusses the benefits and technical pian of opening POS service over PSDN. 在介紹本地分組交換數(shù)據(jù)網(wǎng)現(xiàn)狀的基礎(chǔ)上，對在該網(wǎng)上開放POS業(yè)務(wù)的好処及有關(guān)技術(shù)方案進行了討論。PSDN Public Switched Digital Network 公共交換數(shù)字網(wǎng) 返回 PSDN