单项选择题
A.保护 B.合并单元 C.智能终端 D.远端模块
A.0x88B8 B.0x88B9 C.0x88BA D.0x88BB
A.10mV,1mA B.1mV,1mA C.10mV,10mA D.1mV,10mA
A.1000s B.1500s C.2000s D.2500s
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