Please state the frequency of the fire drills and confirm that these are recorded.
请描述消防演习的频率并确实这些演习都做了记录。
Frequency is one of the most important operational state parameters of power system.
频率是电力系统运行最重要的状态量之一。
Frequency is one of the most important operational state parameters of power system.
频率是电力系统运行最重要的状态量之一。
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