field generator短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 场频信号发生器 The result shows that the permanent magnet generator presents here has a series of advantage in size, weight, and efficiency over the wound- field generator. 另外，本文还设计了一台电励磁的交直流发电机，电磁设计结果表明，永磁电机在体积、重量、效率方面都很有优势。 cnki