What are the full meaning of PD,RD, and AD?

来源: blue5star 于 2010-09-08 22:52:31 [] [旧帖] [给我悄悄话] 阅读数 : (83 bytes)
回答: 终于绿了，NSC 由 顺理成章 于 2010-09-03 21:50:11

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What are the full meaning of PD,RD, and AD?

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