Which of the following is NOT a characteristic of British government（）
A. It offers the Queen high political status and supreme power
B. It is both a parliamentary democracy and a constitutional monarchy
C. It is one of the oldest representative democracies in the world
D. It has no written form of constitution
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Which of the following is NOT based on the fact of House of Commons（）
A. Most members belong to the major political parties
B. Members of House of Commons are expected to represent the interests of the public
C. Members of House of Commons receive salaries and some other allowances
D. Member of House of Common elect the Prime Ministers and the Cabinet
In the following narrative about the CSMA/CD protocol, the error one is（）
A. Suitable for wireless networks for wireless link sharing
B. Send data frames while detecting conflicts
C. Minimum frame length needs to be limited based on network span and data transfer rates
D. When the signal propagation delay approaches 0, the channel utilization rate approaches 100%
The physical and logical topology of Ethernet using a single hub is（）and（）respectively
A. Star topology, Bus topology
B. Star topology, Ring topology
C. Bus topology, Star topology
D. Tree topology, Bus topology
Before communication, the exchange mode that needs to establish physical connection between the sender and the receiver is（）
A. Circuit switching
B. Message exchange
C. Packet switching
D. Store and forward exchange
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