单项选择题

In the network where the host 202.119.224.201 is located, the broadcast address within the network is ( )
A、202.119.224.255
B、202.119.224.0
C、202.119.255.255
D、202.119.0.0

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If A is an n×n matrix whose eigenvalues are all nonzero, then A is nonsingular. ()

答案：正确

单项选择题

为了避免传输过程中帧的丢失,数据链路层采用的方法是( )

A．计时器超时重发
B．帧编号机制
C．循环冗余校验码
D．汉明码