in site短语¹¹³⁹⁹ 基本例句 化同位 Based on the analysis of the ratio of the strength and price of all kinds of steel bars, the future of steel bars in cast in site and precast reinforced concrete structures is discussed. 通过对各种钢筋性能与经济效益的对比指标——强度价格比的分析比较，从技术与经济角度探讨在现浇及预制混凝土结构中钢筋优化的方向。 cnki