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- J55级石油套管J55 class oil pipe
- P110钢级石油套管P110 oil casing
- N80级石油套管在线形变热处理工艺On-line Thermomechanical Treatment Process for N-80 Grade Oil Casing
- J55石油套管J55 steel grade for oil casings
- CSP线铌微合金化直缝焊石油套管用钢J55的开发Development of Nb-microalloyed J55 Hot Rolled Strip Used for ERW Casing For Petroleum in Baotou CSP Plant
- 级联connection
- J55热轧带钢Hot rolled strip J55
- 大学英语四级College English Band 4
- 船级ship' classification
- 石油套管螺纹多功能量具校验仪Multifunctional Master Gauge for Oil Casing Thread Gauges
- 三级片third-grade film
- 无级stepless
- 石油套管petroleum casing pipe
- 级配graduation
- 介绍了包钢CSP厂采用Nb微合金化技术开发直缝焊石油套管用热轧钢带J55的过程。This paper introduce how to develop hot rolled strip used for J55 ERW casing for petroleum by using the technology of Nb micro alloying in BaoTou CSP plant.
- 第二级secondary
- 他们那时正在沙漠中勘探石油。There were prospecting for oil in the desert.
- 大学英语六级考试CET-6 [College English Test, Band Six]
- 开发海底石油to exploit the oil under the sea
- 第一级first step