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继电器内的浮控开关发动报警信号。
A float operated switch in the relay is used to initiate an alarm signal.
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明亮的LED指示灯显示继电器状态和信号强度。
Bright LED indicators show relay status and signal strength.
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明亮的LED指示灯显示继电器状态和信号强度。
Bright LED indicators show relay status and signal strength.
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