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16.What should you think carefully about before renting a car?Theyou need.17.How can you get a best deal and save money when renting a car?Byoffered by different car rental companies.18.Why are you advised to have the car rental company's phone number?In case you need to.19.What should you remember to do if you are returning the car to an airport?Remember toto check in to your flight.20.Why should you fill the gas tank before returning the car?To save you extra fuel and.

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A. 对
B. 错

A. ξ≤ξb为大偏拉构件,ξ>ξb为小偏拉构件
B. N作用在As与A's之间为小偏拉构件,N作用在As与A's之外为大偏拉构件
C. e>0.3h0为大偏拉构件,e0≤0.3h0为小偏拉构件
D. N≤Nb为大偏拉构件,N>Nb为小偏拉构件

A. 截面破坏时,受拉钢筋是否屈服;
B. 截面破坏时,受压钢筋是否屈服;
C. 受压一侧混凝土是否压碎;
D. 纵向拉力N的作用点的位置

A. 如果ξ>ξb,说明是小偏心受拉破坏;
B. 小偏心受拉构件破坏时,混凝土完全退出工作,全部拉力由钢筋承担;
C. 大偏心构件存在混凝土受压区;
D. 大、小偏心受拉构件的判断是依据纵向拉力N的作用点的位置;