试题与答案

离心泵电动机温度过高的原因是什么?

题型:问答题 简答题

题目:

离心泵电动机温度过高的原因是什么?

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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法国和德国的科学家费尔和格林贝格尔由于发现了巨磁电阻(GMR)效应,荣获了2007年诺贝尔物理学奖,如图所示的是研究巨磁电阻特性的电路示意图,当闭合S1、S2后,使滑片P向左滑动的过程中,指示灯明显变亮,则下列说法正确的是

A.滑片P向左滑动过程中电磁铁的磁性减弱

B.滑片P向左滑动过程中电磁铁的磁性增强

C.磁场随巨磁电阻阻值的减小而增大

D.巨磁电阻的阻值随磁场的增强而明显增大

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