[单项选择]

Both bus and tree topologies are characterized by the use of multipoint（）．For the bus，all stations attach，through appropriate hardware（）known as a tap，directly to a linear transmission medium，or bus．Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the（）．A transmission from any station propagates the length of the medium in both directions and can be received by all other（）．At each end of the bus is a（），which absorbs any signal，removing it from the bus．

A transmission from any station propagates the length of the medium in both directions and can be received by all other（）．
A. routers
B. stations
C. servers
D. switches

[单项选择]

Both bus and tree topologies are characterized by the use of multipoint（）．For the bus，all stations attach，through appropriate hardware（）known as a tap，directly to a linear transmission medium，or bus．Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the（）．A transmission from any station propagates the length of the medium in both directions and can be received by all other（）．At each end of the bus is a（），which absorbs any signal，removing it from the bus．

Both bus and tree topologies are characterized by the use of multipoint（）．
A. medium
B. connection
C. token
D. resource

[填空题]在Bus/Tree结构中，通常使用两类传输技术：基带传输和_____________。

[简答题]Type B Villa is characterized
A. A．2 levels
B．3 bathrooms
C．4 bedrooms

[单项选择]The Canadian population is chiefly characterized by its (47)______ duality. In other words, most Canadian speak either English or French. (48)______their origins, most Canadians attend school, work and play in either the French or English language or, in some cases, in both. However, Canada has a variety of minority groups who keep__(49)______ cultural characteristics. For a long time the Canadian Government (50)______ a policy of assimilation. But it did not work. (51)______ from different countries still kept their own cultures, religions, languages, and ways of life. At school even the French-speaking children and English-speaking children did not enjoy learning each other’s language. So in 1971, the Canadian Government (52)______ a policy of multiculturialism, recognizing that cultural pluralism within a bilingual framework was the essence of the Canadian society. Accordingly immigrants may be instructed in at least one official language to help them become full (53)______ in

[填空题]Many politicians are characterized by an inconsistency of platform during crises, to the extent that they are rarely________encouraging and________similar behavior in their colleagues.
A. A．averse to ... facilitating
B．abhorrent of ... foreshadowing
C．confident about ... dissuading
D．diffident in ... triggering
E．radical about ... quelling

[填空题]Bipolar disorder is characterized by cycling mood changes. Most[y, such changes are gradual.