Silicon is a hard, brittle material registering 72. 6 on the rockwell "a" hardness scale . 硅是硬而脆的材料，根据Rockwell“A”硬度分度测值为726。
The hydrogenation can be controlled to produce any degree of hardness desired in the product . 为了生产所需要的任何硬度的产品，可对氢作用加以控制。
A certain degree of stem solidness results in damaged and desiccated eggs and impaired larval movements . 一定的茎秆硬度会致使虫卵损伤和脱水，削移幼虫的移动。
The public desires water which is low in hardness and total solids, noncorrosive, and non-scale-forming . 人们希望水的硬度及固体含量都低，无腐蚀性，不生成水垢。
Once a satisfactory system of lubrication has been secured the hardness of the interacting elements becomes critical . 一旦获得了满意的润滑系统，相互作用的元件的硬度就成为紧要之事。
There are changes in mechanical properties of the fabric such as weight, thickness, stiffness, permeability, or breaking strength and elongation . 有织物机械性能的改变，诸如重量，厚度，硬度，透气，断裂强力和伸长度等性能的改变。
Among these physical properties are appearance, wear resistance, hardness or brittleness, residual stress, porosity, thickness, and deposit uniformity . 这些物理性能有外观，抗磨损性，硬度或脆性，残余应力，孔率，厚度和沉积层的均匀度。
Shore hardness test - calibration of reference blocks 肖氏硬度试验.标准块的校准
Test method for brinell hardness of metallic materials 金属材料布氏硬度测试方法
Test method for vickers hardness of metallic materials 金属材料维氏硬度测试方法
