【名词&注释】
钢筋混凝土(reinforced concrete)、市场分析(market analysis)、分析研究(analysis and research)、烧结多孔砖(fired perforated brick)
[单选题]下列关于烧结多孔砖(fired perforated brick)的描述,正确的是()。
A. 烧结多孔砖(fired perforated brick)通常是指大面上有空洞的砖
B. 烧结多孔砖(fired perforated brick)分为四个质量等级
C. 烧结多孔砖(fired perforated brick)分为六个强度等级
D. 烧结多孔砖(fired perforated brick)使用时孔洞平行于受压面,受力均匀,强度较高