GB/T 39385-2020塑料管道系统热塑性塑料管材环柔性的测定标准
英文:Plastics piping and ducting systems—Thermoplastics pipes—Determination of ring flexibility GB/T 39385-2020介绍: 国家标准《塑料...
英文:Plastics piping and ducting systems—Thermoplastics pipes—Determination of ring flexibility GB/T 39385-2020介绍: 国家标准《塑料...