As PMI testing technology has advanced, former practices of testing only a fraction of all parts and assemblies have been replaced by 100% comprehensive materials testing in thousands of plants.

• 由于采购经理人指数测试技术先进，前者的做法，测试中只有一小部分的所有部件和组件已更换了100 %25的综合材料试验，在数以千计的工厂。