煤系

  • n.coal measures; coal series

煤系煤系

煤系

coal measures

石油英语词汇(C4) ... coal measures 煤层组 Coal Measures 煤系 coal mine 煤矿 ...

coal series

a series of ... classified frequency series 分组频率级数 coal series 煤系 coarse thread series 粗螺纹系 ...

热词推荐