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【单选题】
图示物体M悬挂在弹簧AB上，弹簧上端由于曲柄滑块机构的带动作铅垂直线运动，其振幅为a， 圆频率为ω， 即O1C=asinωt 式中长度以m计，t 以s 计。已知M重4N，弹簧在0.4 N力作用下伸长0.01m，a=0.02 m，ω=7 rad/s。求受迫振动的规律。【图片】A.
x =0.04sin7 t (m)
B.
x =0.03sin7 t (m)
C.
x =0.05sin7 t (m)
D.
x =0.07sin7 t (m)
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【单选题】______was regarded as America s poet laureate and invited to read his poem at the inauguration of President kennedy.
A.
T. S. Eliot
B.
E. E. Cummings
C.
Robert Frost
D.
Ezra Pound
【单选题】Thomas Jefferson was inaugurated (举行就职典礼) on March 4, 1801. He was the first President to take the oath of office (宣誓就职) in the nation's permanent capital, Washington, D.C. Although Washington was a n...
A.
The Presidential Palace was not located there.
B.
It contained many old buildings in 1801.
C.
It was not the first capital of the United States.
D.
Thomas Jefferson was a newcomer there in 1801.
【单选题】Recognize the Figures of Speech in the Following Sentences and Appreciate how they are used. 1 ) Let both sides explore what problems unite us instead of belaboring those problems which divide us. ( J...
A.
contrast
B.
couplet
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