轴承等级无缝钢管
bearing grade seamless steel tubes
Spindle bearing grade seamless steel tubes 主轴轴承等级无缝钢管
Oil-bearing grade of core岩心含油级别
《The seamless steel tubes》 and the stainless steel bars are painted in different colours by lots.
无缝钢管和不锈钢条不同票被涂成不同颜色.