English
Before the construction of each work, it is necessary to check the technical indicators of the materials used, for steel and cement must be re-inspection report and factory certificate double control under the premise of qualified before use; Sand and stone can be used only after the reinspection report is qualified.Spanish
Antes de la construcción de cada proyecto, se comprobarán los índices técnicos de los materiales utilizados, y el acero y el cemento se utilizarán bajo el doble control del informe de inspección y el certificado de conformidad de la fábrica. La arena y la piedra no se utilizarán hasta que el informe de nueva inspección esté cualificado.
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