What is 6_d_ certificate?

来源: leappad 于 2010-09-20 05:36:40 [] [博客] [旧帖] [给我悄悄话] 本文已被阅读： 次 (111 bytes)
What is 6 d certificate? What if there is no 6d certificate at closing? Is it possible to get it later? Thanks!
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