自动低频卸载;自动低频减负荷 under frequency load shedding: 低频率自动负载减少automatic frequency load shedding: 自动频率负载减少automatic load shedding device: 自动减荷装置automatic frequency and load regulator: 自动调频调载器automatic load frequency control: 自动负载频率控制下载手机词典可随时随地查词查翻译