下列实际情景运用了三角形稳定性的是_刷题宝

题干

下列实际情景运用了三角形稳定性的是（）

A：人能直立在地面上

B：校门口的自动伸缩栅栏门

C：古建筑中的三角形屋架

D：三轮车能在地面上运动而不会倒

上一题下一题 0.0难度选择题更新时间:2018-08-27 11:48:37

答案(点此获取答案解析）

C

同类题1

阅读文言文，回答问题

【甲】秦王欲以五百里之地易安陵，安陵君弗敢易！秦王不悦。安陵君因使唐雎使于秦。……秦王曰：“天子之怒，伏尸百万，流血千里。”唐雎曰：“大王尝闻布衣之怒乎？夫专诸之刺王僚也，彗星袭月；聂政之刺韩傀也，白虹贯日；要离之刺庆忌也，仓鹰击于殿上。此三者皆布衣之士也，怀怒未发，休祲降于天，与臣而将四矣，若士必怒，伏尸二人，流血五步，今日是也。”挺剑而起。秦王色挠，长跪而谢之。

（节选自《战国策·唐雎不辱使命》）

【乙】公输盘为楚造云梯之械，成，将以攻宋。子墨子闻之，起于鲁，行十日十夜而至于郢，见公输盘。……王曰：“善哉。虽然，公输盘为我为云梯，必取宋。”子墨子解带为城，以牒为械。公输盘九设攻城之机变，子墨子九距之。公输盘之攻械尽，子墨子之守圉有余。公输盘诎。子墨子曰：“吾知子之所以距我，吾不言。”楚王问其故。子墨子曰：“公输子之意不过欲杀臣。杀臣，宋莫能守，乃可攻也。然臣之弟子禽滑厘等三百人，已持臣守圉之器，在宋城上而待楚寇矣。虽杀臣，不能绝也。”楚王曰：“吾请无攻宋矣。”

（节选自《墨子·公输》，有删改）

同类题2

____ happened to be no one in that house when the typhoon hit the area.

同类题3

图为人的体细胞中一对基因（Aa）位于一对染色体上的示意图，下列叙述不正确的是（　　）

同类题4

阅读下列短文, 从每题所给的四个选项（A、B、C和D）中选出最佳选项。

On this mini-coach tour, we will visit the popular sightseeing landmarks and their surrounding areas — Windsor Castle, Stonehenge & Salisbury Cathedral.

Tour Schedule

The first stop is Windsor Castle, journey time about 45 minutes from London. You will have free time to explore the Castle grounds and the surrounding historic town.

We then head to Stonehenge, journey time about 1hour. Stonehenge is the most famous prehistoric (史前的) site in the UK.

We then head to Salisbury, journey time about 15 minutes. It's one of the finest examples of medieval (中世纪) Cathedrals in Britain. It's also the country's tallest spire (尖塔). In free time, exploring the Cathedral in Salisbury is also a nice choice.

After visiting some of the most popular sites, we'll head back to Central London, arriving at 18:30.

07:30 ~ 09:15 Central London picks-up

London Bridge (7:30 am), Kings Cross (7:55 am), Baker Street (8:10 am), Victoria (8:25 am), South Kensington (8:50 am), Earls Court (9:00 am), Hammersmith (9:15 am).

We advise you to arrive at your pick-up point at least 10 minutes earlier to wait for the bus before your tour, ensuring you do not miss your tour!

Book now

To book this mini-coach tour, please click (点击) on the date of travel using the calender below.

Adult Price: £65.00.

Child Price: £59.00.

同类题5

已知二次函数f（x）=x²+bx+4

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