一个连接4个刚片的复铰相当于4个约束。 - 查题网

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高等继续教育 / 结构力学

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一个连接4个刚片的复铰相当于4个约束。
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积分

结构力学

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Deep inside a mountain near Sweetwater in East. Tennessee is a body of water known as the Lost Sea. It is listed by the Guinness Book of Would Records as the world's largest underground lake. The Lost Sea is part of an extensive and historic cave system called Craighead Caverns. The caverns have been known and used since the days of the Cherokee Indian nation. The cave expands into a series of huge rooms from a small opening on the side of the mountain. Approximately one mile from the entrance, in a room called "The Council Room," many Indian artisfacts have been found. Some of the items discovered include pottery, arrowheads, weapons, and jewelry. For many years there were persistent rumors of a large underground lake somewhere in a cave, but it was not discovered until 1905. In that year, a thirteen-year-old boy named Ben Sands crawled through a small opening three hundred feet underground. He found himself in a large cave half filled with water. Today tourists visit the Lost Sea and ride far out onto it in glass-bottomed boats powered by electric motors. More than thirteen acres of water have been mapped out so far and still no end to the lake has been found. Even though teams of divers have tried to explore the Lost Sea, the full extent of it is still unknown. (1)The Lost Sea is unique because it is _ _ _ _ _ _ _ _ .（2分）A、part of a historical cave systemB、the biggest underground lake in the worldC、listed in the Guinness Book of World RecordsD、the largest body of water in Tennessee(2)The Craighead Caverns have been known _ _ _ _ _ _ _ _ .（2分）A、through history B、since the time of the Indian nationsC、since 1905D、since divers explored them(3)Who located the Lost Sea in recent times?（2分）A、The Cherokee Indians.B、Tourists.C、Ben Sands.D、Scientists.(4)What was found in "The Council Room"?（2分）A、A small natural openingB、A large caveC、Another series of roomsD、Many old Indian objects(5)It can be inferred from the passage that the Craighead Caverns presently serve as _ _ _ _ .（2分）A、an underground testing siteB、an Indian meeting groundC、a tourist attractionD、a motor boat race course新发展英语综合教程（二）

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