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单选题
The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.
A
persistence
B
pulse repetition rate
C
pulse length
D
resolution
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单选题On some projects, especially ones of smaller scope, activity sequencing, activity resource estimating, activity duration estimating, and（）are so tightly linkedthat they are viewed as a single process that can be performed by a person over a relatively short period of time.A
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单选题The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with（）.A
An atomic time standardB
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考题
单选题On a half-duplex Ethernet LAN, two hosts attempt to send data simultaneously,resulting in a collision. Following this collision, what will the hosts do?（）A
The destination host sends a request to the source for retransmission.B
The jam signal indicates that the collision has been cleared.C
The hosts will attempt to resume transmission after a time delay has expired.D
An electrical pulse indicates that the collision has cleared.E
The router on the segment will signal that the collision has cleared.F
The hosts will do nothing, as the higher layers are responsible for data error correction and re-transmission.
考题
单选题The transmission time duration of a single pulse of radio-frequency energy is a function of the（）.A
persistenceB
pulse repetition rateC
pulse lengthD
resolution
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