1. ISO11961-2008  Petroleum and natural gas industries — Steel drill pipe - Second Edition
2. ISO 10407-2:2008 (Identical), Petroleum and natural gas industries—Rotary drilling equipment—Part 2: Inspection and classification of used drill stem elements
感激不尽~
[ 此贴被笑韵在2009-10-20 09:41重新编辑 ]