反演结果能明显反映出主力油层葡I2、葡I3层的横向变化，为成功完钻大庆第一口阶梯状水平井提供了有利技术保证。
The in-version result can reflect the transverse variation of the main layer of PI2, PI3, it provides the technique guarantee for drilling the first ladder horizontal well successfully.
该变频器采用单元串联多电平技术，可以得到阶梯SPWM波形，无需输出滤波器，可直接驱动普通电动机。
The (frequency) converter (adopted) multilevel technology with cells series, which could obtain stepped SPWM waveforms, and could drive ordinary motor directly with no output filter.
介绍了阶梯蜗舌技术，并将其应用于一种排油烟的离心风机。
Technology of step tongue volute is introduced and applied to a centrifugal fan for discharging lampblack.
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