单项选择题
What is the proper way to refresh sendmail？（）
A.sendmail -bt B.sendmail -ba C.refresh -s sendmail D.startsrc -s sendmail
单项选择题 AclientcannotmountafilesystemfromanNFSserver.Whichofthefollowingoptionsisthemostprobablecauseforthemountfailure？（）
单项选择题 Onasystemwidebasis，whichofthefollowingproceduresisbesttomakeNISnameresolutiontakeprecedenceoverDNS？（）
单项选择题 WhichofthefollowingfilesshouldbeeditedtoenableSNMP？（）
