近日,一场涉及伦敦金属交易所(下称“LME”)及其结算机构LME Clear Limited(下称“LME C…
● 粗糙度(ROUGHNESS ) ID : Ra ≤ 0.4μm OD: Ra ≤ …
国内国际尺寸公差对照 Comparison between domestic and internationa…