单项选择题
如果调制解调器的调制速率为4800baud,采用8相调制,那么该调制解调器的数据传输速率为( )。
A. 14400bps
B. 2400bps
C. 28800bps
D. 600bps
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单项选择题
LANs can be connected by using bridges, which operate in the ( )。
A. physical layer
B. data link layer
C. network layer
D. transport layer
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单项选择题
Which of the following operations belongs to message passing
A.read and write
B.save and receive
C.wait and signal
D.P and V
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