第18题: [单项选择]下列关于选择拱轴线形式的叙述,哪项是不正确的? A. 应根据建筑要求和结构合理相结合来选择 B. 理论上最合理的拱轴线应该是使拱在荷载作用下处于无轴力状态 C. 理论上最合理的拱轴线应该是使拱在荷载作用下处于无弯矩状态 D. 一般来说,拱在均布荷载作用下比较合理的拱轴线形式是二次抛物线 参考答案:B 答案解析:理论上最合理的拱轴线应是使拱在荷载作用下处于完全轴压状态。
第21题:[单选题]( )Move the pilot ladder clear of discharge A.The pilot ladder shall be lifted clear of water B.The pilot ladder shall be shifted forward C.The pilot ladder shall be shifted aft D.The pilot ladder shall be shifted clear of outlets 参考答案:D
第35题: [单项选择]According to Sinotime,during the period of this Charter,should the Vessel be requisitioned by the government of the Vessel’s nationality,hire to()from the time of her requisition. A. continue B. stop C. commence D. cease 参考答案:D