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2 弹簧A和B,劲度系数 。.(1)将弹簧拉长同样的距离;(2)拉长两个弹簧到某个长度时,所用的力相同。在这两种情况下拉伸弹簧的过程中,对哪个弹簧做的功更多? 4.2 题解图
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【简答题】B Many young people want to be pop stars. Pop stars are rich. Many people think they are leading a happy and easy life. In fact, they have very hard lives. They spend much of their time on travel. Som...
【简答题】可作为教育技术学研究的因变量的有
【简答题】可作为教育技术学研究的自变量的有
【简答题】D As public playgrounds grow increasingly worn and shabby, the for-profit centers offer clean, safe, supervised activity as well as a variety of challenging exercises to develop youngsters’ physical f...
【单选题】Not only his parents but also his sister ________ the museum.
A.
are going to
B.
is going to c. are going D. is going
【简答题】信用关系中,信用的暂时性特征是以( )为先决条件。
【单选题】When his wife returned from abroad, Kevin ____ his paintings at the art museum in his hometown.
A.
was exhibiting
B.
exhibited
C.
would exhibit
D.
had been exhibiting
【单选题】From the passage, we know that ______.
A.
Cheng Ho died on the way of his last voyage
B.
Cheng Ho ended his seventh voyage in 1433
C.
the disappearing of China's economic domination of the South Pacific led to Cheng Ho's death
D.
it took Cheng Ho 30 years to visit 37 countries
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