quantity of demand for materials 中文意思是什麼
quantity of demand for materials
解釋
物質需要量-
The asphalt road materials development have been droved by the development of highway construction, so the quantity and the quality of asphalt materials increase progressively, especially, the demand for performance of weighty traffic asphalt is further high, our country must energetically study and empolder modified asphalt materials for highway construction because of performance of homemade asphalt
公路建設的飛速發展帶動了瀝青路面材料的發展,與之伴隨的對瀝青材料的數量逐步增多,而對其質量要求也越來越高,尤其對高等級公路建設所需的重交瀝青性能要求更高,由於國產瀝青的性能因素決定我國必須大力研究開發能夠滿足高等級公路建設的改性瀝青材料。
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