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A. reached B. revealed C. art D. experiments E. repeated F. floated G. print H. laid I. safely J. across K. covered L. lying M. footsteps N. through O. flew On Dec.17, 1903, Orville Wright, an American, flew safely in a heavier-than-air machine for 12 seconds. He and his brother Wilbur had made a lot of (1) _______ and had taken immense trouble to study the (2) ______ of flying in gliders before they attempted to fly their aeroplane. Orville came down (3) _________ after the first short flight, and on the same day the experiment was (4) _____ three times. The longest of these flights (5) _______ a distance of 852 feet and lasted 59 seconds. The machine which was used had an engine developing only sixteen horse-power but the aeroplane (6) ______ a speed of 35 miles an hour. The two brothers continued their experiment after their first success, and in 1908 Wilbur gave some exhibition of flying in France which astonished all who saw them. The Wright brothers (7) ________ the foundation of modern flying. Soon others followed in their (8) ________. Louis Bleriot, a Frenchman, flew (9) _______ the English Channel from Calais to Dover in 1909. Prizes were offered for the Wrights from one place to another. Competition increased. The aeroplane improved more and more as its behavior became better understood. More powerful engines were developed. In 1919 Sir John Alcook and Sir Arthur Brown made the first flight across the Atlantic Ocean, and in the same year an aeroplane (10) _______ from England to Australia. The age of air travel had arrived.
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【简答题】已知f(x)是定义在R上不恒为0的函数,且对于任意的a,b∈R有f(ab)=af(b)+bf(a). (1)求f(0),f(1)的值; (2)判断f(x)的奇偶性,并证明你的结论; (3)若f(2)=2,求使得 f( 2 -n ) n >- 1 8 (n∈ N * ) 成立的最小n的值.
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A.
用封闭线所围成的区域
B.
不完整的区域
C.
敞开的区域
D.
半封闭的区域
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【单选题】A large crate of mass m is placed on the back of a truck but not tied down. As the truck accelerates forward with an acceleration a, the crate remains at rest relative to the truck. What force causes ...
A.
the normal force
B.
the force of gravity
C.
the force of friction between the crate and the floor of the truck
D.
the “ma” force
E.
none of these.
【单选题】古籍阅览室、基藏图书室开放时间是?
A.
星期五13:30——17:00
B.
星期五8:30——11:30
C.
星期六8:30——11:30
D.
星期天8:30——11:30
【单选题】primitive hominid of late Pieistocene.
A.
dead
B.
extant
C.
active
D.
extinct
【简答题】材料:亮亮喜欢打人,经常有小朋友因此而找王老师告状。今天,小朋友们坐在餐厅等待吃饭时,明明经过亮亮身边,顺手戳了亮亮一下。亮亮还手打了明明一下。这时,王老师经过,看到亮亮打人,一把抓住他,用手狠狠戳他的头,推得他直摇晃,并生气地说:“看你还打人!”见此情景,小朋友纷纷在王老师面前数落亮亮曾经打了自己,王老师听后更生气了。她用力拍打亮亮的肩膀,同时生气地大声吼道:“你真是讨人嫌!长得人不像人!” 问...
【多选题】影响资金时间价值大小的因素有()
A.
资金额
B.
利率和期限
C.
计息方式
D.
风险
【单选题】A large crate of mass m is placed on the back of a truck but not tied down. As the truck accelerates forward with an acceleration a, the crate remains at rest relative to the truck. What force causes ...
A.
the normal force
B.
the force of gravity
C.
the force of friction between the crate and the floor of the truck
D.
none of these
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