Rockwell hardness test

例句：

1. 1.The Rockwell hardness test is usedto measure the hardness of metals.
   洛氏硬度测试用于测量金属的硬度。
2. 2. The Rockwell hardness test isa standardized method for measuring the hardness of materials.
   洛氏硬度测试是一种标准化的方法，用于测量材料硬度。
3. 3. TheRockwell hardness test is widely usedin industry to determine the quality of metalproducts.
   洛氏硬度测试在工业中广泛使用，用于确定金属产品的质量。