单项选择题
A.3 B.2 C.4 D.1
A.1 B.4 C.2 D.3
A.38400 B.4800 C.9600 D.115200
A.deleteeNB-->unmangeeNB B.shutdowndiscoveryrule-->deletediscoveryrule C.unmangeeNB-->deleteeNB D.deletediscoveryrule-->shutdowndiscoveryrule
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