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当前学科:通信设备安装工
题目:
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关于同轴电缆线对的外导体或高频对称电缆对的屏蔽层接地正确的是()
A . 不能直接接地
B . 输入口不能接地
C . 输入口不能接地、输出口可接地
D . 输出口接地,但如果需要输入口也可接地
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