high quality hard metal can be prepared by simple breaking and grinding from hard metal scrap without any chemical treatment.
采用该法,只须采用破碎和细磨,不经任何化学处理,就能高质量地回收利用废硬质合金。
metal scrap can be melted down and reused.
废旧金属可以熔化后再使用。
a boy searches for metal scrap under an oil tanker after it was attacked and set alight.
阿富汗瑙谢拉,一个男孩在一辆被袭击并点燃的输油车残骸中寻找金属。
steel making arc furnace uses electric power to melt steel. the amount of power put into the metal scrap is controlled by positioning three electrodes.