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单项选择题
A.255.255.255.128
B.255.255.255.192
C.255.255.255.224
D.255.255.255.240
单项选择题
A.255.255.255.192
B.255.255.255.224
C.255.255.255.240
D.255.255.255.248
多项选择题
A.255.255.255.192
B.255.255.255.224
C.255.255.255.240
D.255.255.255.248