single sided pattern plate是什么意思

用法例句

The vacuum quenching and tempering technology for the large-sized die-casting dies were tested,and were successfully applied in production.

介绍了国内外常用压铸模具材料及显微组织状况 ,提出了优化国产模具材料组织的措施 ,并对大型压铸模具的真空淬、回火工艺进行了试验研究。