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螺钉:机器螺钉:因头型和槽型不同而分成许多品种。头型有圆柱头、盘头、沉头和半沉头几种,头部才形为开槽(一字材)和十字槽两种。见GB6GB67—69及GB818—82等。紧定螺钉:紧定螺钉利用其尾端,起防止工件间相互位移及传递较少扭矩的作用。见GB7GB73——7GB7GB78等。内六角螺钉:内六角螺钉适用于安装空间较小或螺钉头部需要埋入的场合。,见GBGB6GB6191和GB2672—2674等。
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4WE10C3X/CW230N9比例阀供应永吉为了使地源热泵系统健康发展，加强空调行业和水文地质、地矿勘探、海洋海港行业之间的沟通和合作极为重要。另一方面，为蓄能井选址进行的土质和地下水勘探等一些*性很强的作业和大量的地下施工等，使投资规模加大，这就导致系统的造价和安装费用高，成本回收周期长，也成为地源热泵空调技术应用上的的障碍。结语：类似地源水经过热泵机组后，只是交换热量，水质几乎没有发生变化，经回灌至地层或重新排入地表水体后，不会造成对原有水源的污染之类的说法应谨慎。
