一个质点同时在几个力作用下的位移为.Δr=4i-5j(SI),其中某个力为F=-3f(SI),则此力在位移过程中所做的功为
单选题
A
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举一反三
质量分别为ma和mb(ma:≠mb),速度分别为Va和Vb(Va≠Vb)的两质点a和b,受到相同的冲量作用,则质点
题目答案
C
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在研究刚体绕固定轴转动时,类似于牛顿第二定律F=Tna的规律是刚体绕固定轴转动的
题目答案
A
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相对于高纬度地区而言,在地球赤道附近()
题目答案
D
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一质点做匀变速圆周运动时,其()
题目答案
B
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It is essential that everything in advance.()
题目答案
B
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In studio recordings, new techniques made possible effects that not even an electronic band could produce .
题目答案
A
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In August 1977, a satellite to gather data about the 10 million black holes which are thought to be in the Milky Way.
题目答案
B
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Decision makers must have some way of determining of several alternatives is best.()
题目答案
D
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the bosses cannot do without profit, workers have an edge.
题目答案
C
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A good worker in a key spot could, he kept up production, take all the coffee breaks he wanted, and the bosses would very likely look the other way.
题目答案
A
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暂无解析