单项选择题
A.6 B.7 C.8 D.10
A.入度B.出度C.入度与出度之和D.入度与出度之差
A.31 B.32 C.33 D.16
A.162.105.142.27 B.192.168.0.1 C.256.256.129.1 D.10.0.0.1
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