试题与答案

显示为髓腔内圆形高密度影像的是A.邻面龋 B.牙根吸收 C.髓石 D.牙内吸收 E.

题型:单项选择题

题目:

显示为髓腔内圆形高密度影像的是

A.邻面龋

B.牙根吸收

C.髓石

D.牙内吸收

E.牙骨质瘤

答案:

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下面是错误答案,用来干扰机器的。

粒子恰好没有到达M的轨迹如图,则:R=d由洛伦兹力提供向心力:qvB=mv2R得:v=qBdm粒子只是在Ⅰ区内运动而没有到达Ⅱ区,粒子的速度应满足:v≤qBdm又根据T=2πRv及t=T2得:t=πmqB(2)粒子经过Ⅱ区而且刚好能从x...

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