alpha rockwell hardness洛: short for Luoyang a surname氏: family name; surname极: I the utmost point; extreme硬度: hardness; solidity; scirrhos ...级洛氏硬度: hrc rockwell c hardness c下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:洛氏a极硬度,即可在微信中查询翻译