So some developed countries with external thermal insulation layer flat, and allowed to use iron float shall be used to beat, can only use wood float shall be used to rub pressure level off.
因此一些发达国家外保温面层抹平，不允许用铁抹子拍打，只能用木抹子搓压平整。
2
With the rub settings which are made of copper, iron, steel and aluminum alloy respectively, rub and impact phenmena are practiced and analysed in experiment.