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In order to study the Cl- penetration depth in polypropylene fiber concrete with different volume, indoor artificial method was used to simulate dry-wet cycle, and the concentrations of AgNO3 solution indicator on the Cl- concentration at the color change boundary of the specimens was investigated. The results indicated that the chloride penetration depth increased as the cycles of dry-wet was increased,...
Presale services are premise of product sales, and key elements of improving enterprises' economic efficiency, but most enterprises lack a comprehensive understanding of presale services. The article classified presale services into product-based presale and project-based presale, and described knowledge framework of presale service management. The core of presale service management contains deliverables...
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