______A．255.255.255.224B．255.255.255.240C．255.255.255.248D．255.255.255.252A．B．C．D．

______

A．255.255.255.224

B．255.255.255.240

C．255.255.255.248

D．255.255.255.252

A．

B．

C．

D．

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