【单选题】【消耗次数：1】
梁式桥的受力特点是（ ）。
①
在竖向荷载作用下有水平反力，有弯矩
②
在竖向荷载作用下无水平反力，无弯矩
③
在竖向荷载作用下有水平反力，无弯矩
④
在竖向荷载作用下无水平反力，有弯矩
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【单选题】
对称抛物线三铰拱在满跨竖向均布荷载作用下，其截面内力特点是（ ）。
①
弯矩=0.剪力=0，轴力≠0
②
弯矩=0，剪力≠0，轴力≠0
③
弯矩≠0，剪力=0，轴力=0
④
弯矩≠0，剪力≠0，轴力≠0
【单选题】
图示(a）(b）(c）三种荷载作用下，梁AB的支座反力为（）
①
（a）A=m/l(↓）B=m/l(↑）(b）A=0B=P(↑）(C）A=P/2(↑）B=P/2(↑）
②
（a）A=m/l(↑）B=m/l(↑）(b）A=P(↑）B=0(C）A=P/2(↓）B=P/2(↑）
③
（a）A=m/l(↓）B=m/l(↓）(b）A=0B=P(↑）(C）A=P/2(↑）B=P/2(↑）
④
（a）A=m/l(↓）B=m/l(↑）(b）A=0B=P(↑）(C）A=P/2(↓）B=P/2(↑）
随机题目
【单选题】
由于幼儿的肌肉中水分多，蛋白质及糖原少，不适合他们的运动项目是( )。
①
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②
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③
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④
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