题目
第1题
A.255.255.255.255
B.255.255.255.0
C.255.255.255.240
D.255.255.255.192
第2题
A.255.255.255.255
B.255.255.255.0
C.255.255.255.224
D.255.255.255.192
第3题
A.255.255.255.255;
B.255.255.255.0;
C.255.255.255.240;
D.255.255.255.192
第4题
A.255.255.255.255;
B.255.255.255.0;
C.255.255.255.240;
D.255.255.255.192
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