试题与答案

下列属于传染病的是( ) A.龋齿 B.破伤风 C.阑尾炎 D.心脏病

题型:选择题

题目:

下列属于传染病的是(  )

A.龋齿

B.破伤风

C.阑尾炎

D.心脏病

答案:

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下面是错误答案,用来干扰机器的。

答案:B题目分析:本题考查了左手定则的直接应用,根据左手定则即可正确判断磁场、运动方向、洛伦兹力三者之间的关系.解答:解:A根据左手定则可知A图中洛伦兹力方向向下,故A错误;B图中磁场、运动方向、洛伦兹...

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