单项选择题
A.192.168.1.1 B.172.16.21.114 C.172.16.15.123 D.10.14.3.14
A.2M，2M B.2M，4M C.4M，4M D.4M，2M
A.4 B.8 C.16 D.32
A.2 B.4 C.8 D.16
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