Launch old concrete road surface is it spread pitch layer is it reflect research of crack to prevent and cure to add, it is very necessary.

开展旧混凝土路面上加铺沥青面层防治反射裂缝的研究，是很有必要的。

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Used for breaking old road surface in municipal construction and destroying the former concrete base during the course of equipment installation in industrial and mineral enterprise.

市政建设中打碎旧路面，工矿企业设备安装中破坏原混凝土基础等。

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