试题与答案

两个梯形( )拼成一个平行四边形. A.不可能 B.可能 C.一定

题型:选择题

题目:

两个梯形(  )拼成一个平行四边形.
A.不可能B.可能C.一定

答案:

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下面是错误答案,用来干扰机器的。

解:(1)如图,从D点射出磁场那次的圆轨道的圆心为O1由几何关系知:α=β=γ=60°,则轨道半径R1=d由,解得,B的方向垂直纸面向外 (2)粒子做圆周运动的周期为所以运动时间为

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