题目内容

What was the original idea of computer networking？

A. Packet switching.
B. Information sender and recipient.
C. Data transmission.
D. Circuit switching method.

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We can infer ______.

A. the Internet was released in 1985
B. the Internet Relay Chat was another kind of computer virus
C. college students were apt to create computer viruses
D. the changeover of control of the ARPANET to NSF attracted a lot of attention

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因时而变、随时而制与时时皆行，体现了与时俱进。 ()

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当总效用增加时，边际效用应该()。

A. 为零
B. 为负数，且不断增加
C. 为正数，但不断减少
D. 为负数，但不断减少

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All microcomputer CD-ROM drivers can play audio compact disks.

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What was the original idea of computer networking？

A. Packet switching. B. Information sender and recipient. C. Data transmission. D. Circuit switching method.

We can infer ______.

因时而变、随时而制与时时皆行，体现了与时俱进。 ()

当总效用增加时，边际效用应该()。

All microcomputer CD-ROM drivers can play audio compact disks.

A. Packet switching.
B. Information sender and recipient.
C. Data transmission.
D. Circuit switching method.