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【单选题】
The Wright brothers, Wilbur and Orville, began publishing the West Side News from 1889, a small four-page newspaper. Their printing venture lasted until 1896. Their father, Milton, was a Bishop in the church and his wife, Susan, was a well-educated woman. It was she who stimulated the Wright Brothers interest in mechanical things. In 1990, the brothers successfully tested their 50-pound biplane glider in Carolina, and subsequently made a number of revisions. Controlled, powered flight had seemed impossible until Orville Wright took off on the 17th, December 1903. The key to the Wright Brothers' success was that their engineering had gone beyond the trial and error methods of their contemporaries. Having only very limited resources they showed great scientific ingenuity. When their test flights did not produce as much lift as they had expected, they went back to first principles and carried out a series of scientific experiments, starting with the bicycle balance and moving on to their famous wind tunnel experiments. They were the first to understand how the lift from the aerofoil changes in flight, and the first to design their propellers as a form. of aerofoil. Despite the financial burdens of all their research, testing, and the many aircraft built, the Wright Brothers were never financed by outsiders. The bicycle was a hot item at that time, and their bicycle shop financed everything. The first passenger to ever fly in an airplane was Charles W. Furnas who was taken aloft by Wilbur Wright on May 14, 1908 for a flight of 28.6 seconds duration. Orville and Wilbur flew together only once in their airplane for their father to see, but decided it unwise, because if they crashed, no one could carry on their work. The Wright Brothers inherited an aptitude for independent judgment, personal courage and mechanical talents of superior caliber. Two older brothers, Reuchlin and Lorin and a sister Katharine, went on to college, while Orville and Wilbur had only high school educations, and never officially graduated. However, their solid scientific methods had set free the ancient dream of human flight. The first American to fly after the Wright Brothers was Glenn H. Curtiss, who flew his 'June Bug' for the first time on June 20, 1908. The first airplane purchased by the American Government was a Wright Biplane. What is the passage mainly about?
A.
The first controlled, powered flight.
B.
The beginnings of aviation.
C.
The Wright Brothers.
D.
The Wright family.
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参考答案:
举一反三
【判断题】某企业主要经营儿童“六一”礼品袋,他们将不同玩具、学习用品装在一个袋子里进行营销,这采取的是附赠品包装策略。( )
A.
正确
B.
错误
【单选题】电气设备金属外壳保护接地线,接地干线可按相应电源相线截面积的()选用。
A.
1/2
B.
1/3
C.
1/4
D.
1/5
【多选题】关于接地线设计正确的说法是()。
A.
接地线可以从户外架空引入,但必须全程注意多选择接地点可靠连接
B.
接地线不宜与信号线平行走线或相互缠绕
C.
接地线应选用铜芯导线,如无条件可使用铝材
D.
保护地线应选用黄绿双色相间的塑料绝缘铜芯导线
E.
保护地线上严禁接头,严禁加装熔断器或开关
F.
接地端子必须经过防腐、防锈处理,其连接应牢固可靠
G.
通信设备到用户接地排的距离不应超过50米,且越短越好
【判断题】低应变法能够检测桩身的承载力
A.
正确
B.
错误
【简答题】正火、回火、退火、淬火的英文单词
【判断题】某企业主要经营儿童“六一”礼品袋,他们将不同玩具、学习用品装在一个袋子里进行营销所采取的是附赠品包装策略。( )
A.
正确
B.
错误
【单选题】从严格意义上来讲,现代公共关系产生于19世纪末20世纪初的()。
A.
英国
B.
日本
C.
美国
D.
法国
【多选题】对电缆线路接地系统的要求是()
A.
回流线型号正确
B.
接地箱体必须选用铁磁材料
C.
接地线不得连接在可拆卸接地体上
D.
接地电阻应符合要求
【判断题】德国人因为爱车才会将文化衍生到交通、选车、用车、车展、汽车博物馆、汽车主题旅馆等等。
A.
正确
B.
错误
【单选题】患者,45岁,女,下班后感到心慌,数脉搏时发现每隔两个正常的搏动后出现一次过早的搏动,此脉搏是
A.
二联律
B.
三联侓
C.
奔马侓
D.
间歇脉
E.
脉搏短绌
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