in 1876, the french lavoisier proposed basic principles of gas cutting. in 1887, the united states successfully tested
the present invention discloses a tape cutting welding machine, which includes tape cutting mechanism and located on t
milling mainly by transmission gear while drilling and milling machine mainly by the belt drive and universal milling
almost all of the performance and wear resistance of the material have a relationship, and the wear mechanism in diffe
12月30日，宝华党支部书记、总经理徐磊一行3人来到兰山区水务局，将一面写有“排忧解困显担当 情系企业见初心”的锦旗及一封感谢信送到兰山区水务局党组书记、局长李继芳手中，感谢…
联合国贸易和发展会议(贸发会议)日前发布报告显示，2021年，全球外国直接投资(fdi)总额强劲反弹，比2020年增长77%，从9290亿美元增至1.65万亿美元，超过新冠疫…
