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【单选题】
关于使用ISDN和Modem上网的说法，哪一条是不正确的?A.
ISDN传输速度高于Modem
B.
Modem在两侧终端需增加A/D，D/A转换，而ISDN提供端到端的数字连接
C.
Modem需长时间占用电话线，ISDN则可以通话、上网同时进行
D.
其他3种说法都不正确
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