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If a coil has no metal core it has an air core.
如果线圈没有金属芯子，它就有一个空气芯子。
youdao
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FIG. 6 is a top view of an induction coil of the present invention.
图六为本发明的一个感应线圈的侧视图。
youdao
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FIG. 6 is a top view of an induction coil of the present invention.
图六为本发明的一个感应线圈的侧视图。
youdao