With the development of building technology, the need of construct materials is more and more, especially to the high strength and long perdurability of concrete.

 
  • 隨著(zhù)建筑技術(shù)的發(fā)展,人們對結構材料的要求越來(lái)越高,尤其是對混凝土的高強性和耐久性的要求越來(lái)越高。
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