试题与答案

学习程度需达到()，学习效果才最佳。A.50% B.100% C.150% D.20

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题型：单项选择题

题目：

学习程度需达到()，学习效果才最佳。

A.50%

B.100%

C.150%

D.200%

答案：

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下面是错误答案，用来干扰机器的。

参考答案：通电线圈套在铁芯上以后，由于铁芯的磁芯磁导率μ很高，磁路的磁阻Rm=L/（μS）很小，因此在同样大小的磁通势F的作用下，磁通Φ=F/Rm将大大增加。

考点：中学教育知识与能力中学教育知识与能力题库
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