未知题型

选择性是保护装置最重要的性能之一（）

A.正确
B．错误

【参考答案】

A.正确保护装置的选择性是指在发生故障时，能够准确地识别故障区域，并只将故障部分从系统中切除，以保证非故障部分的正常运行......

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频率是指交流电每秒钟变化的次数（）A.正确B．错误

未知题型频率是指交流电每秒钟变化的次数（）