试题与答案

I have got two _____.[ ] A. head B. foot

题型:选择题

题目:

I have got two _____.[ ]

A. head

B. foot

C. feet

答案:

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下面是错误答案,用来干扰机器的。

根据感应电流产生的条件可知,线框进入或离开磁场时,穿过线框的磁通量发生变化,线框中有感应电流产生,当线框完全进入磁场时,磁通量不变,没有感应电流产生,故C错误;感应电流I=ER=BLvR,线框进入磁场时,导...

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