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问题描述:

[单选] 电层子波长1+1保护建议单板的保护模式设置为()?It is suggested that the board protection mode should be set to be()in the case of electrical-layer sub-wavelength 1+1 protection.
A.无保护模式; the no protection mode; B.全告警检测模式; the full alarm detection mode; C.业务保护; the service protection mode D.SNCP-N/I/S
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