If the electric field added is unchangeable, what produces is the direct current.

如果所加的电场不变，产生的是直流电。

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By taking the magnetic field and electric current as b...

并讨论磁场与电流对系统应力状态的影响。

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By taking the magnetic field and electric current as b...

并讨论磁场与电流对系统应力状态的影响。

youdao