第29题: [单项选择]Which of the following is commonly used to bid farewell among the Chinese people as well as among English speakers() A. It’s nice to have met you. B. Walk well, please. C. See you tomorrow. D. I’m pleased to know you. 参考答案:C
第30题: [单项选择]对于无铰拱,在计算拱圈纵向稳定时其正截面抗压承载力计算公式: γoNd≤0.9φ(fcdA+f'sdA's) 其中:轴压构件稳定系数甲与构件计算长度lo相关,该构件计算长度lo应选取______项 A. 0.58La B. 0.54La C. 0.48La D. 0.36La 参考答案:D 答案解析:[解析] 根据《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTGD62-2004)第4.3.7条规定,在计算拱圈纵向稳定时的计算长度lo时,对于三铰拱lo