frequency measuring relay 测频继电器
non-measuring relay 非测量用继电器
phase-angle measuring relay 相角测量继电器
temperature-measuring overload relay 测温式过载继电器
measuring frequency relay 测量用继电器
relay measuring 继电器测试
dc load-measuring reclosing relay 直流重合闸继电器
computerized relay protection measuring device 微机型继电保护测试装置
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