下面关于局域网特点的叙述中,不正确的是 ① 使用专用的通信线路,数据传输速率高 ② 能提高系统的可靠性和可用性③ 响应速度慢 ④ 通信时间延迟较低,可靠性好⑤ 不能按广播方式或组播方式进行通信
A.
②④
B.
③⑤
C.
②③
D.
①⑤
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