CF608 for building AC, CF609 for auto AC

来源: 于 2009-05-17 20:34:41 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

both takes about two hours study, 30 minutes test ( 50 questions but need to get 42 correct), and pay ~$20 for the test.