Uponauser’sfirstvisittothewebsite，whichtwooperationsarealwaysperformedwhenthegetSessionmethodiscalledwithnoargumentsinaservlet？（）

A．市场调查 B．顾客分析 C．市场细分 D．选择目标市场 E．市场定位

A．Windows2000serverwith2GBfreespace，2GBRAManddual1GHzproc，usingAccess2003 B．Linuxwith2.6kerneland2GBfreespace，2GBRAManddual1GHzproc，usingMySQL C．Windows2000serverwith2GBfreespace，2GBRAM，dual1GHzprocwithSMBIOSusingMSJetdatabase D．Windows2003serverwith2GBfreespace，2GBRAM，dual1GHzprocwithSMBIOSusingMSSQLdatabase

A．Thecodecompilesand“s=”isprinted. B．Thecodecompilesand“s=null”isprinted. C．Thecodedoesnotcompilebecausestringsisnotinitialized. D．Thecodedoesnotcompilebecausestringscannotbereferenced. E．Thecodecompiles，butaNullPointerExceptionisthrownwhentoStringiscalled.

<img src='https://img2.soutiyun.com/ask/uploadfile/2019-03-27/3df7729bcc7239c102c42d25526aba2f.jpg' /> A.GranttheSELECTpermissionontheSales.Customersobjecttothesales_employeerole. B.GranttheSELECTpermissionontheSales.CustomerContactsobjecttothesales_employeerole. C.GranttheSELECTpermissionontheSales.ContactListobjecttothesales_employeerole. D.GranttheEXECUTEpermissionontheSales.GetContactobjecttothesales_employeerole.

A．tprof B．iostat C．vmstat D．filemon