单项选择题

Whichofthefollowingproblemshasoccurredwhenamenuappearsa……

Which of the following problems has occurred when a menu appears and prompts the user to "copy a dump to external media?（）

A. The external dump device is full.
B. The dump device was set to /dev/hd7 before the dump happened.
C. The boot failed while copying the dump from paging space to a file.
D. The dump device was not set to a paging device before the dump happened.

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单项选择题Afilenamed core existsinthecurrentdirectory.Whichofthefollowingcommandsshouldbeusedtodeterminewhatcreatedthe core file?（）

A. dump -t core
B. strings core
C. trace -a core
D. crash core /unix_up

单项选择题Whichofthefollowingoptionsindicateswhyitisimportanttotalktotheuserandaskappropriatequestionsaboutasoftwareproblem?（）

A.Software problems don't generate errors.
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A.Mon Mar 20 14:01:00
B.Sun Mar 19 18:40:00
C.Fri Feb 20 12:28:00
D.Wed May 04 03:19:10

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C.The ping command is being used excessively.
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