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单选题
60. A from time to time B in time C sooner or later D on occasion
A
A
B
B
C
C
D
D
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B. Reply from 1.1.1.1:Destination host unreachable
C. Reply from 1.1.1.1:bytes=32 time=0ms TTL=255
D. Reply from 2.2.2.2:bytes=32 time=0ms TTL=126
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单选题We’d better do the following EXCEPT ______.A
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Add one hour to the times listed under the reference stationsB
Subtract one hour from the time differences listed for the subordinate stationsC
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问答题Q4: Do you think it’s a good idea to move staff around within a company from time to time? (Why?/Why not?)
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单选题You executed the following query in your database： SELECT oldest_flashback_scn， oldest_flashback_time FROM V$FLASHBACK_DATABASE_LOG； What would you determine from the output？（）A
The time when the last flashback operation in your database was performed.B
The time when the first flashback operation in your database was performed.C
A list of flashback operations performed in your database using SCN and time.D
The approximate time and the lowest system change number （SCN） to which you can flash back your database.
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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
Daylight Savings TimeC
Eastern Standard TimeD
Greenwich Mean Time
考题
单选题What is the best description of serialization delay？ （）A
the time it takes for a Layer 3 switch or a router to switch a packet from an inbound interface to the queue of the outbound interfaceB
the time it takes for a propagate from source to destinationC
the time it takes to place a frame on the physical medium for transportD
the time a packet resides in the outbound queue of a router
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单选题What best describes processing delay？（）A
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单选题Most tree frogs change colors from time to time to fit in with its environment.A
MostB
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单选题变量v_time=’23-MAY-00’， 如下那条语句返回值为’01-JAN-00’？（）A
select round（v_time，’DAY’） from dualB
select round（v_time，’YEAR’） from dualC
select round（v_time，’MONTH’） from dualD
A select round（to_char（v_time，’yyyy’）） from dual
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