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【判断题】
一个沿x 轴做简谐振动的弹簧振子,振幅为A ,其振动方程用余弦函数表示,t=0s 时质点过x= ,向振动,则该振动的 或A.
正确
B.
错误
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举一反三
【单选题】Over the years, as the musical 'Rent' has reached milestone after milestone—playing around the world in more than 200 productions from Boise to Little Rock to Reykjavik—the thousands of people who hav...
A.
Rent was a classical work
B.
Michael Greif was a conservative director
C.
Rent was conservative
D.
people were nostalgic
【简答题】Over the past ten years this town (hit)twice by earthquakes.
【简答题】In the past, American families tended to be quite large. Parents raising five or more children were common. Over the years, the size of the family is becoming smaller. One reason for this is an increa...
【单选题】Over the years this country seemed to waver unpredictably between love and hatred for the United States, sometimes begging for its attention, sometimes lashing out at it.
A.
vibrate
B.
hesitate
C.
alternate
D.
fluctuate
【单选题】This doctor has _____ a good reputation over the years.
A.
built on
B.
built up
C.
built in
D.
built out
【单选题】Over the years this country seemed to waver unpredictably between love and hatred for the United States, sometimes begging for its attention, sometimes lashing out at it.
A.
hesitate
B.
fluctuate
C.
vibrate
D.
alternate
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