In accordance with the above captioned letter of credit requirements , we hereby certify that the above captioned shipment consists of new material and was manufactured in accordance with american buildings company quality control procedures as certified by the metal building manufactures association and the american institute of steel construction 根据上述题词信用证的要求，我们特证明上述项下货物是采用新材料并按美国建筑公司质量控制程序制造的，并得到金属厂房制造商协会和美国钢建筑研究院的认可。
The main points of hlsip quality control includes : during the design stage , it is necessary to control the scheme comparison and optimum design , esp . the waterwork , electromechanical device and irrigation region planning , to improve the design quality and pay attention to control the long - term benefits of design results ; during construction period , the supervisor should help proprietor choose construction contractor , sign the construction contract , supervise the manufacture of equipment and strictly execute the quality control procedure to subject the construction to controlled mode ; in addition , the contractors must improve their quality self - control , maintain the notion " quality first " and insist the full process , multiway , and multi system control of construction quality 高扬程梯级提水灌溉工程质量控制的重点包括：设计阶段控制好方案对比、设计优化，特别是水工建筑、机电安装、灌区规划等多专业多目标的确定和协调，提高设计质量和深度，注重控制设计成果的长期效益；施工阶段协助业主选择好施工承包商，制定出严谨、完备的施工合同，搞好设备监造，严格执行质量控制程序，使工程施工时时处于受控状态；同时要提高承包商的质量自控能力，坚持施工质量的全过程、多方法、多体系控制。
