Man-made static magnetic fields are generated wherever DC currents are used, such as in electric trains or industrial processes such as aluminium production and in gas welding.
在使用直流电的地方即产生人为的静电磁场，例如在电车或诸如铝生产和气焊等工业操作程序中。
It can be caused by a build-up of static electricity indoors from carpets or clothing made of man-made fibres, or from TV sets, duplicators or computer display screens.
它可能是由室内地毯、人造纤维制成的衣服、电视机、复印机或电脑显示屏积聚的静电引起的。
It can be caused by a build-up of static electricity indoors from carpets or clothing made of man-made fibres, or from TV sets, duplicators or computer display screens.
它可能是由室内地毯、人造纤维制成的衣服、电视机、复印机或电脑显示屏积聚的静电引起的。
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