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Which tow statements are most correct regarding opt-in models?（）
A . A based opt-in model uses virtualized identifiers
B . A based opt-in model uses hardware values as identifiers
C . A logical server opt-in model uses virtualized identifiers
D . A logical server opt-in model uses hardware values as identifier
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Look! The boy （）a model ship and he （） it in the lake now.
A . made；is sailing
B . has made；is sailing
C . made；sails
D . has made；sail
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In the OSNR model for EDFA amplifiers， SNR OUT = 1/（1/SNR IN + FhvB/P IN ）， what does SNR IN represent？（）
A . the signal to noise of the current optical amplifier
B . the signal to noise of the previous amplifier or source
C . the signal to noise introduced by the optical multiplexer
D . the accumulated noise to signal ratio of the optical channel
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The interaction of these seven elements is what determines the（）in any instance of speech communication.
A . outcome
B . income
C . become
D . welcome
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In the 7-layer OSI model, which layer switching will take place?（）
A . Layer one
B . Layer two
C . Layer three
D . Layer four
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In the OSI model, at which layers do WANs operate at?（）
A . Applicationlayer
B . Presentationlayer
C . Sessionlayer
D . Transportlayer
E . Networklayer
F . Datalinklayer
G . Physicallayer
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What are the three models of quality of service （QoS） in a network？（）
A . Resource Reservation Protocol （RSVP）
B . first-in， first-out （FIFO）
C . best-effort
D . CBWFQ
E . IntServ
F . DiffServ
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Which statement describes the distributed call control model in VoIP networks？（）
A . The gateway voice-capable device is configured to support call control directly performing call setup， call maintenance， and call teardown
B . The gateway voice-capable device has a local call routing table configured through a routing protocol.
C . The gateway voice-capable device relies on a call agent to support call control.
D . The gateway voice-capable device relies on a gatekeeper to support call setup， call maintenance， and call teardown.
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In the OSNR model for EDFA amplifiers, SNR OUT = 1/(1/SNR IN + FhvB/P IN ), what does SNR IN represent?（）
A . the signal to noise of the current optical amplifier
B . the signal to noise of the previous amplifier or source
C . the signal to noise introduced by the optical multiplexer
D . the accumulated noise to signal ratio of the optical channel
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The Unified Modeling Language is a standard graphical language for modeling object-oriented software（）can show the behavior of systems in terms of how objects interact with each other.
A . Classdiagram
B . Componentdiagram
C . Sequencediagram
D . Use case diagram
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The（）technique involves using project characteristics in a mathematical model to predict total project cost. Models can be simple or complex.
A . costaggregation
B . reserve analysis
C . parametricestimating
D . funding limit reconciliation
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When K hides in the mountain, why are his senses interaction with world depicted in detail?
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The superiority of Internet as a mass medium lies in its high speed, diversification, personalized services, interactivity, openness, richness and globalization.
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For the left hand of the two hand model, which lifestyle factor is NOT in the model?
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Interactional view is in accordance with_____ competence.
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Byron was Browning’s first role model in verse writing. ( )
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The main difference between waterfall model and evolutionary model is in（)
A.different activities
B.different project size
C.different project management manner
D.different way of activity organization
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In e-commerce, supplier interacts with （)A．manufacturerB．customerC． shipment provider.D．di
In e-commerce, supplier interacts with ()
A．manufacturer
B．customer
C． shipment provider.
D．distributors.
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In the OSI model, at which layers do WANs operate at？（）
A．Applicationlayer
B．Presentationlayer
C．Sessionlayer
D．Transportlayer
E．Networklayer
F．DatalinklayerG.Physicallayer
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Interactive online learning cart be realized when teachers and students use technological resources in education.
A．Y
B．N
C．NG
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In communicative teaching, ______are expected to interact with other people, either in the flash, through pair and group work, or in their writing.
A、Teachers
B、students
C、Teachers and students together
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In the dark street, ther weren’t single person ____ she could turn for help.
A．that
B．who
C．from whom
D．to whom
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Despite differences in conversational style, speakers are helped by automatic patterns in daily interactions such as 'Hi'. 'Hi', known as_______
A、adjacency pairs
B、preference structure
C、dispreference structure
D、insertion sequence
