constant voltage self-excited synchronous alternator
自励恒压同步交流发电机：constant voltage self-excited synchronous alternator 自力式自动开关阀：automatic self-generating valve ..
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constant voltage self-excited synchronous alternator
恒压自激同步交流发电机
以上为机器翻译结果，长、整句建议使用 人工翻译 。