在集中设备处加热(或冷却)转换可以是手动或自动.Heating or cooling change over at the central plant may be manual or automatic.在绝大数工厂里, 材料经常需要加热或冷却.In almost any plant, materials constantly being heated or cooled.根据所输送介质需要,螺杆泵装置可提供加热或冷却结构.Accor...