hardnessn.坚硬;困难;严厉
hardness measuring magnifier硬度测量放大镜
hardness mensuring magnifier硬度测量放大镜
hardness and wear resistance硬度和耐磨性
hardness-testing automation硬度测试自动化
Hardness is a strict teacher.困难是一位严厉的导师。
Hardness Assurance Monitoring System硬度确保监视系统
Hardness Conversion Tables for Metals金属硬度换算表