C35Economist⁵³⁵⁸¹⁺¹ 例句 The C25, C30, C35 normal concrete tests are made, which include impermeability, frost resistance and steel rust tests. The comprehensive evaluation of concrete durability is derived. 同时对 C25、 C30、 C35强度等级的普通混凝土进行了抗渗试验和抗冻试验及钢筋锈蚀试验,对其耐久性作出了一个综合评价。 cnki