用指向性函数分别描述了医用线列阵单频波和宽带波声场。

The directivity function is used to describe the sound field of single-frequency and broad-band waves produced by a medical linear array.

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用指向性函数分别描述了医用线列阵单频波和宽带波声场。

The sound field of the Continuous Wave and the Impulsive Wave is described by the directivity function.

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本文着重介绍了20千瓦变速恒频波力发电系统的控制功能和保护体系。

This paper mainly discusses the control and protection system for the 20kw VSCF (Variable Speed Constant Frequency) Wave Power Electric Station.

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