单项选择题

IEEE 1394具有__3____位地址空间，IEEE 1394的通信协议具有三个协议层，不包括___4___。

3处选择（）

A．8
B．16
C．32
D．64

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单项选择题
Any computer, be it a large PC or a small embedded computer, is useless if it has no means to interact with the outside world. I O communications for an embedded computer frequently happen over a bus called the ______.
A．I/O bus
B．Memory Bus
C．Device bus
D．Internal Bus
单项选择题
Conventionally, a computer consists of at least one processing element, typically a ______ and some form of memory．
A．device
B．CPU
C．controller
D．network
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