尽可能重复使用纸张。Try where possible to reuse paper.使尺子与纸张的中部成一条直线.Align the ruler and the middle of the paper.他在纸张的两面都写字以节省用纸.He writes on both sides of the sheet to conserve paper....
For surfacing welding on cold die and cutting tool.冷冲模及切削刀具的堆焊.The Research of the Microstructure of the Co - Cr - W Alloy Plasma Surfacing.Co -Cr-W 系等离子弧堆焊合金层显微结构的研究.To protective material used in surfacing and finishin...