This second problem "is the construction quality of the building itself - its structure is not completely sound or its materials are not very strong, which is possible," Mr. Ma said.
第二个问题是因为“建筑本身的质量差——可能结构不是很安全，或者材料不结识。”马先生说。
For the particularity of construction enterprises, the quality validity of system management of certificated enterprises becomes the universally concerned problem.
由于建筑施工领导特殊性，这些获证的建筑企业质量管理体系的有效性成为了社会各界普遍关心的问题。
For this reason, quality problem reasons of roofing projects are analyzed from the aspects of the design, construction and materials and corresponding control measures are given.
为此我现在从设计、施工和材料三方面简单分析产生屋面防水工程质量问题的原因，并提出相应的防治措施。
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