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公共交换电话网
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public switched telephone network,PSTN
公共交换电话网
由国家电信部门统一管控的,面向所有人使用的全球语音通信公共网络系统。
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yellow mud drum
yellow news
yellow patch
yellow phosphorus
yellow pond turtle
yellow prussiate of potash
yellow resident registration
Yellow River
Yellow River Cantata
Yellow River Conservancy Commission of the Ministry of Water Resources
Yellow River Conservancy Press
Yellow River diversion over Huaihe river
Yellow River estuary
Yellow River flood in 1958
Yellow River flood in 1982
Yellow River Flows to the East
Yellow River Institute of Hydraulic Research
yellow River Levee
Yellow River of Ningxia Huizu Zizhiqu
Yellow River Research Association
Yellow River to Qingdao project
Yellow River water allocation in 1987
Yellow River Yellow Earth Yellow Race
yellow-sage
Yellow Sea bottom cold water
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