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我现在到了多瑙森根,这里是多瑙河的源头。
I'm now in Donaueschingen, the source of the Danube.
youdao
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本文采用多根细丝线附在带电导体上的方法,来演示电场线。
The method of solving electrostatic field with electric field line;
youdao
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本文采用多根细丝线附在带电导体上的方法,来演示电场线。
The method of solving electrostatic field with electric field line;
youdao