hardnessn.坚硬;困难;严厉
hardness ratio硬度比
hardness creep硬度蠕变
hardness range硬度范围
hardness grade强度等级
hardness scale硬度计,硬度表
hardness value硬度值
hardness resin固体树脂
hardness point硬度标
hardness index硬度指数
hardness curve硬度曲线