API SPec 7F:2013中文(或英文)版
API Spec 7F-2010 (2013) Oil Field Chain and Sprocketshttp://bbs.infoeach.com/forum.php?mod=viewthread&tid=195270&fromuid=128592
回帖需要完成任务 感觉还好不错
API SPEC 7F-2010,8th Edition 中文版
http://bbs.infoeach.com/forum.php?mod=viewthread&tid=195301&extra=
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