A. short range
B. point-to-multipoint voice
C. data transfer
D. modem
第1题
There are two types of encryption:()
A. secret key
B. double keys
C. missing key
D. public key
第2题
Getting to a U.S. site from outside this country is quite ()
A. transparent
B. instantaneous
C. complicated
D. accurate
第3题
the Amazon.com business model combines()
A. direct marketing
B. the intermediary role
C. virtual community
D. content provider
第4题
brokerage models include()
A. marketplace exchange
B. content-targeted advertising
C. buy/sell fulfillment
D. bounty broker
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