A.共享應(yīng)用程序 B.收發(fā)信件 C.電視會議 D.處理文檔
A.255.255.240.0 B.255.255.255.240 C.255.255.255.224 D.255.255.248.0
A.00111101.10000111.10010110.01010001 B.11000001.10100011.10010000.00000101 C.11001010.01101101.11001011.00010001 D.10000001.00000011.10010000.00000100