For security reasons， an administrator is asked to modify the system to prevent someone from leaving a terminal logged in. Which of the following options would enable a five minute timeout for all users（） ["Add the following line to \/etc\/environment： TMOUT=300","Add the following lines to \/.profile TMOUT=5 export TMOUT","Run the following command： chuser -u ALL -a TIMEOUT=5M","Run the following command： chsec -u ALL -a TIMEOUT=600"]
某企业根据按照应收账款余额的10%计提坏账准备。该企业2005年应收账款余额为2000万元，坏账准备余额为200万元。2006年发生坏账50万元，发生坏账收回60万元，2006年底应收账款余额为2500万元，那么该企业2006年应该提取的坏账准备为（）万元。 ["40","50","30","60"]
Which command will show network statistics such as kernel malloc and mblk failures？（） ["ifconfig -m","netstat -m","iptrace -a","errpt -a"]
Which of the following commands should be used to obtain information about the installed software？（） [" smit system"," smit installp"," smit licenses"," smit list_software"]
某待估设备重置成本为27万元，经查阅，已使用4年，评估人员经分析后确定该设备尚可使用5年，那么它的实体性贬值额为（）。 ["10万元","12万元","15万元","18万元"]
请简述若SWITCH变流器报出Overcurent故障可能的故障点以及检查的范围.
