Severely degenerated discs (grade v) also showed a trend toward greater bulging, but this was not significant.
严重地椎间盘退变(V级)也显示有较大的膨出的倾向，但并不显著。
The work spindle get four-grade rotate speed, which is driven by a couple of two-grade v-belt pulley.
由一对两级三角皮带轮传动工件主轴，使其获得四级转速；
CVN(Charpy V-notch) toughness and grain size number of J55 grade oil casings produced by Baotou Iron and Steel Company did not meet the reiative standards in the past.
本文针对包钢原来生产的J55石油套管冲击韧性不足，晶粒粗大的问题开展研究。
CVN(Charpy V-notch) toughness and grain size number of J55 grade oil casings produced by Baotou Iron and Steel Company did not meet the reiative standards in the past.
本文针对包钢原来生产的J55石油套管冲击韧性不足，晶粒粗大的问题开展研究。
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