The system also features a rugged 4 driven roll design for positive wire feeding.

该系统也配有一个坚固耐用的4轮送丝驱动设计，能产生稳定的送丝。

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The corona voice strengths and levels of radio interference produced by positive polarity wire have little changes, and those produced by negative polarity wire increase with temperature.

正极性导线电晕声音和无线电干扰变化都不大；负极性导线电晕声音和无线电干扰都增大。

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To analyze the formation of surface discharge on a dielectric plate under positive nanosecond impulse voltage in air, a wire to plane electrode system with a barrier of negative film was used.

采用感光胶片作为阻挡介质的针-板放电系统，解析空气中固体电介质上纳秒正脉冲表面放电的形成过程。

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Additional tests may include a nuclear stress test to assess for blockages in the coronary arteries, and if positive, a cardiac catheterization, an invasive test which involves threading a thin wire into the heart to assess for blockages in the coronary arteries as well.

FORBES: Coronary CT Scans May Save You (And Your Hospital)