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北京市丰台区南苑公社南苑大队,有16台水泵安装了拍门,有25台水泵安装逆止阀。在使用中感到以下几方面拍门比逆止阀好:
Fengtai District, Beijing Nanyuan commune Nanyuan brigade, 16 sets of pumps installed beat the door, there are 25 pumps installed check valve. In the use of the following aspects of the door than the check valve is good: