A power choke or transformer has an iron core.

扼流器或变压器有一个铁芯。

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Pipe series: Elbow, tee, cross, movable joint, Bu core, reducer, pipe cap, choke plug, inside the wire, outside the wire, turned-over edge, increaser etc.

管件类： 弯头、三通、四通、活接头、卜芯、大小头、管帽、堵头、内丝、外丝、翻边、异径管。

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A differential-mode choke and a separate common-mode choke can be combined onto a single core.

微分模式扼流器和分离的通用模 式扼流器可以组合在单个磁芯上。

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But there's one problem: Incumbents who jump into disruptive new markets invariably find that the amateurs have aced the core competancies and now command the sales and distribution choke points.

FORBES: Digital rules: The High-Margin Danger Zone