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The invention aims to solve problems in the prior compensation pulse generator, such as complicated electrical excitation structure and unadjustable permanent magnet excitation output.

目的是解决现有补偿脉复杂、永输出不能调节问题。

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经济学人(汇总)

Dr Vetrovec intends to perform his version of the trick at atmospheric pressure, and using permanent magnets.

维特威克博士想要在大气压力永磁体来实现他的这种把戏。

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学院Khan Academy Middle school physics - NGSS初中物理

This makes electromagnets quite different from permanent magnets.

得电磁体与永磁体有很大不同。

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学院Khan Academy Middle school physics - NGSS初中物理

This is different from a permanent magnet because permanent magnets don't need this wire.

这与永磁体不同,因为永磁体不需要这种电

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学院Khan Academy Middle school physics - NGSS初中物理

So let's take a look at that and compare permanent magnets to electromagnets.

让我们看一并将永磁体与电磁体进行比较。

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学院Khan Academy Middle school physics - NGSS初中物理

Permanent magnets also have fixed poles.

永磁体也有固定磁极。

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学院Khan Academy Middle school physics - NGSS初中物理

On the other hand, permanent magnets are always on.

另一方面,永磁体始终处于开启状态。

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学院Khan Academy Middle school physics - NGSS初中物理

Permanent magnets have a fixed strength, but we just talked about how we can change the strength of electromagnets, so electromagnets have adjustable strength.

永磁体的强度是固定的,但是我们刚才讲了如何改变电磁铁的强度,所以电磁铁的强度是调的。

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学院Khan Academy Middle school physics - NGSS初中物理

Permanent magnets do not need a power source, but this means that we can also turn electromagnets on and off, which is pretty cool when you think about it.

永磁体不需要电源,但这意味着我们也以打开和关闭电磁体,想想看,这真是太酷了。

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