JCS23.040.50;23.100.40G33B中华人民共和国能源行业标准NB/T10369一2019矿用塑料护套保温钢管Insulatingpipeswithplasticsheathinmine2019-...
JCS23.040.50:23.100.40C33妇中华人民共和国能源行业标准NB/T10369一2019矿用塑料护套保温钢管Insulatingpipeswithplasticsheathinmine2019...