A acceptable quality 合格质量 acceptance lot 验收批量 aciera 钢材 admixture 外加剂 against slip coefficient between friction surface of high-strength bolted connection 高强度螺栓摩擦面抗滑移 系数 aggregate 骨料 air content 含气量 air-dried timber 气干材 allowable ratio of height to sectional thickness of masonry wall or column 砌体墙、柱容许高厚比 allowable slenderness ratio of steel member 钢构件容许长细比 allowable slenderness ratio of timber com