是去污迹用的,就是担心结束以后会不会破坏砖体,过段时间变得坑坑洼洼。现在的砖表面像是风化腐蚀引起的变色
是去污迹用的,就是担心结束以后会不会破坏砖体,过段时间变得坑坑洼洼。现在的砖表面像是风化腐蚀引起的变色
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