If conservation planning, wet, dry, the surface of a raisin deform internal concrete binding, but also often lead to cracks.

 
  • 如養護不周、時(shí)干時(shí)濕,表面干縮形變受到內部混凝土的約束,也往往導致裂縫。
今日熱詞
目錄 附錄 查詞歷史
国内精品美女A∨在线播放xuan