您要查找的是不是：
- X80级X80 grade
- X80级钢管X80 grade steel pipe
- X80级管线钢X80 pipeline steel
- X80级管线钢管X80 grade pipeline steel pipe
- X80级Nb-Cr钢管Nb-Cr X80 grade steel pipe
- X80级螺旋埋弧焊管X80 grade SSAW pipe
- 通过夏比冲击试验和落锤撕裂试验(DWTT),测得国产X80级直缝埋弧焊接钢管低温韧性。It obtains low temperature toughness of China made grade X80 LSAW pipe by Charpy impacting test and DWTT.
- 级联connection
- 校级field rank
- 英语四级English Band 4
- X80X80 grade
- X80钢X80 steel
- 大学英语四级College English Band 4
- X80管线X80 pipeline
- 一级的firstlevel
- X80钢卷X80 plate coil
- 船级ship' classification
- X80钢管X80 steel pipe
- 三级片third-grade film
- X80管线钢X80 pipeline steel
