Both nonreciprocal birefringent effect and variable polarization effect of microwave ferrite in the symmetrical four-pole magnetized field are discussed in the light of coupling-wave theory.

本文用耦合波理论处理了对称四磁极磁化情况下，微波铁氧体的非互易双折射效应和变极化效应。

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The article describes the conditions in selection of four-pole switch, applicable site and points out the cautions in actual projects.

论述了四极开关选择的条件，应用场所，指出了在实际工程中应注意的问题。

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The paper mainly gives the work condition of neutral current, introduces application of four-pole switch in different grounding systems and problems to be noticed.

文章主要阐述了中性线的工况和各种不同接地系统中四极开关的应用及应用中需要注意的问题。

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Raikkonen's pole in Barcelona means it is the first time since 1983 that four different drivers have held pole position at the season's first four races.

BBC: SPORT | Motorsport | Formula One | Raikkonen denies Alonso home pole

Just 0.087 seconds separated the top four as the Pole headed McLaren's Lewis Hamilton, Ferrari's Fernando Alonso and Red Bull's Mark Webber.

BBC: Robert Kubica fastest in final practice in Korea

Tackling the real North Pole is estimated to take at least four times as long as the magnetic pole, which, at present, is considerably further south.

BBC: Sir Ranulph Fiennes: Up the Pole