试题与答案

急性肾盂肾炎典型的临床表现是什么?

题型:问答题 简答题

题目:

急性肾盂肾炎典型的临床表现是什么?

答案:

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题型:问答题

在光滑绝缘的水平面上,存在平行于水平面向右的匀强电场,电场强度为E.水平面上放置两个静止的小球彳和B(均可看作质点),两小球质量均为m,A球带电荷量为+q,B球不带电,A、B连线与电场线平行.开始时两球相距L,在电场力作用下,A球开始运动(此时为计时零点,即t=0),后与B球发生对心碰撞,碰撞过程中A、B两球总动能无损失.设在各次碰撞过程中,A、B两球间无电量转移,且不考虑两球碰撞时间及两球间的万有引力.求:

(1)第一次碰撞结束瞬间A、B两球的速度各为多大?

(2)从计时零点到即将发生第三次碰撞这段过程中,共经过多长时间?

(3)从计时零点到即将发生第n次碰撞这段过程中,小球A经过的位移大小为多少?

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