单项选择题
A user would like their shell prompt to reflect the current directory. Which of the following environment variables can be set to accomplish this？（）
A.PS1 B.PATH C.PROMPT D.LOCPATH
单项选择题 WhichofthefollowingcommandscanbeusedtogetthesystemreadytophysicallyinsertaPCIhotplugadaptor？（）
单项选择题 WhichofthefollowingcommandscanbeusedtoidentifyallPCIhotplugslotsonaserverandtheircharacteristics？（）
单项选择题 Asystemdumphasoccured.TheLEDdisplayshows0c0.Whatdoesthisindicate？（）
