NTC 77 Método para el Análisis por Tamizado de los Agregados Finos y Gruesos
NTC 44 Tubos de Asbesto Cemento para Conducción de Fluidos a Presión
NTC 33 Método para Determinar la Finura del Cemento Hidráulico por medio del Aparato de Blaine de Permeabilidad al Aire
NTC 32 Tejido de Alambre y Tamices para Propósitos de Ensayo
NTC 31 Cementos. Definiciones
NTC 30 Cemento Pórtland. Clasificación y Nomenclatura
NTC 98 Determinación de la Resistencia al Desgaste de los Agregados Gruesos hasta de 37.5mm, Utilizando la Máquina de los Ángeles
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NBT 47038-2013恒力弹簧支吊架
DLT 819-2010 火力发电厂焊接热处理技术规程
DL 5031-1994 电力建设施工及验收技术规范(管道篇)
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