白改黑到底是个啥工程？

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是把原来的路打了重建，还是修补？</td></tr></tbody></table>


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路基不好的要整好了再在上面铺炒沙</td></tr></tbody></table>


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改成伊拉克工程</td></tr></tbody></table>


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四楼的我想问哈柏油路是啷个样子的？谢谢！</td></tr></tbody></table>


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那不是整个路基都要垫高哦~！</td></tr></tbody></table>


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白改黑&nbsp; &nbsp;就是把水泥砼路面改成沥青砼路面！<br>
不是修补，叫改建吧。</td></tr></tbody></table>


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沥青砼路面</td></tr></tbody></table>


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就是把白天变成黑夜`！</td></tr></tbody></table>


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就是把白天变成黑夜</td></tr></tbody></table>


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<font color="Pink">路基又长高了点....</font></td></tr></tbody></table>


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就是把原来的水泥路改成炒沙路。</td></tr></tbody></table>


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那他们怎么又不打完，又开始补水泥，而且压路机都不用。</td></tr></tbody></table>


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加问个问题：为懒样要白改黑也，或者说有哪些好处？</td></tr></tbody></table>


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噢，终于明白了啥子是“白改黑”了。</td></tr></tbody></table>


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这样灰少些，城市变得清洁点</td></tr></tbody></table>


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