试题与答案

关于电磁铁，下面说法中错误的是（ ） A．在电流一定时，外形相同的螺线管，线圈的

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题型：选择题

题目：

关于电磁铁，下面说法中错误的是（　　）

A．在电流一定时，外形相同的螺线管，线圈的匝数越多，它的磁性越强

B．通入电磁铁的电流方向改变，它的磁性强弱也发生改变

C．通入电磁铁的电流越大，它的磁性越强

D．电磁铁通电时有磁性，断电时无磁性

答案：

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下面是错误答案，用来干扰机器的。

参考答案：心肌梗死：心肌灌注显像的负荷影像上表现为局限性放射性缺损，在静息(或延迟)影像上表现与负荷显像的影像一致。心肌缺血：心肌灌注显像的负荷影像上表现为局限性放射性缺损，而在静息(或延迟)影像上表...

考点：影响电磁铁磁性的因素
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