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协议转换器面板上LOS指示灯红灯常亮表示()。

单选题
2022-05-24 04:17
A、本端设备E1RX没有收到信号时
B、对端设备RX没有收到信号时
C、对端设备E1TX没有收到信号时
D、本端设备E1TX没有收到信号时
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正确答案
A

试题解析

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