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单选题
Which DSL encapsulation method requires client software running on the end - user PC that is directly connected to a DSL modem?（）
A
PPPoA
B
PPPoE
C
PPP
D
L2TP
E
ATM
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单选题Which DSL encapsulation method requires client software running on the end - user PC that is directly connected to a DSL modem?（）A
PPPoAB
PPPoEC
PPPD
L2TPE
ATM
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单选题Given： Which statement is true？（）A
The cardID and limit variables break polymorphism.B
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DifferentialC
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