用偏压法计算横隔梁内力的力学模型是将中衡隔梁近似地视作竖向支承在多跟弹性主梁上的多跨弹性支承简支梁。（）

单项选择题With his work completed, the businessman stepped back to his seat, feeling pleased _____ he was a man of action.A.which B.that C.what D.whether

单项选择题对拉螺栓使用于（ ），保持模板与模板之间的设计厚度，并承受混凝土侧压力及水平荷载，使模板不变形。