短語詞組短語design Variable -speed constant-frequency 變速恒頻variable -speed constant frequency 變速定頻Variable -speed constant-frequency Control System 變速恒頻控制系統(tǒng)AC -Exited Variable-Speed Constant-Frequency 引言交流勵磁變速恒頻;交流勵磁變速恒頻;變速恒頻variable speed -constant frequency WTGS 變速恒頻風電機組 返回 variable-speed constant-frequency