问题
单项选择题
在相同条件下，如果固定桥桥体的长度增加至原来的2倍，则其挠曲变形量变为
A．增加至原来的2倍
B．增加至原来的4倍
C．增加至原来的6倍
D．增加至原来的8倍
E．增加至原来的9倍
答案
参考答案：D
解析：固定桥桥体受力时的挠曲变形量与长度的立方成正比，所以D是正确的。
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在相同条件下，如果固定桥桥体的长度增加至原来的2倍，则其挠曲变形量变为
A．增加至原来的2倍
B．增加至原来的4倍
C．增加至原来的6倍
D．增加至原来的8倍
E．增加至原来的9倍
参考答案：D
解析：固定桥桥体受力时的挠曲变形量与长度的立方成正比，所以D是正确的。
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| The following is a true story. It shows that potential discovered may lead to success. A young man traveled by train. As it was running across a__1__, passengers looked out of the__2__idly and aimlessly. When the train came near a bend it__3__and then an unadorned (简陋的) house came into__4__. It was so obvious__5__the deserted landscape that everybody on the train began to "__6__" it with their eyes wide open. Some passengers__7__began a discussion about it. The young man was also__8__by the scene. On his return he__9__the train at the nearest station and found his__10__to the house. Its__11__told him that troubled by the__12__of the train he wanted to sell the house but__13__would buy it. Soon the young man__14__three thousand dollars for the house, regarding it as a__15__site for advertisement. It was facing the railway__16__where the train had to slow down and the__17__ passengers would cast their eyes at the house to__18__themselves. He managed to get__19__to big companies and tried his best to convince them of the advantage of the place for__20__. Finally the CocaCola Company took a lease on (租用) it to put up promotion signs. The young man was paid 180 thousand dollars for a threeyear rent. | ||||
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