375 The standards “GB” and “YB” provide the method of testing for materials in our country just like the standard ASTM in America.
375 The standards “GB” and “YB” provide the method of testing for materials in our country just like the standard ASTM in America.
在我们GB（国标）和YB（冶标）规定材料的试验方法，正如美国的ASTM标准一样。