The FEM equation of acoustic wave is used to calculate the air-current natural frequency and pressure pulsation in the pipeline.

利用有限元法求解声学波动方程，建立了管内气流的有限元运动方程，计算出管内气柱的固有频率和气流压力脉动。

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The ability to distinguish between current and structural issues has helped turn around Air France's business since the 1980s and 1990s.

区别当前性问题和结构性问题的能力，帮助法航在上世纪80和90年代扭转了业务格局。

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Admittedly, there are various factors contributing to the current worldwide air pollution, but it is undeniable that the exhaust from automobiles is categorized as one of the major elements.

诚然，有很多因素导致了现在的全球空气污染问题，但是不能否认的是汽车废气被归为最重要的因素之一。

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As it stands, Klipsch's G-17 Air is the current AirPlay-enabled soundsystem to beat at its price point.

ENGADGET: Klipsch Gallery G-17 Air soundbar review

Stanway's traders are buying power in load blocks of 250 to 300 megawatts--enough current to keep the air-conditioning and lights on at more than 200 superstores, depending on the weather (and enough to power 250, 000 homes).

FORBES: Discount Juice

He also does something other more mainstream shows of the genre do not - champions new bands and artistes on the current Rock'n'Roll scene, giving them air-time rarely available elsewhere.

BBC: Wiltshire - Presenter Profile: Geoff Barker