单项选择题
A. 0
B. 1
C. 4
D. 7
单项选择题 WhichofthefollowingSCSIsignalingsystemsusesonereturnlineforeveryoutgoingline，islesssusceptibletointerference，signaldegradation，crosstalk，andallowsacablelengthofupto25meters？（）
单项选择题 Afterupgradingaservermotherboardtothelatestfirmwarerevision，configuringLANaccessintheSSU（SystemSetupUtility）fails.WhichactionshouldbetakenFIRSTtocorrectthisproblem？（）
单项选择题 Thecurrentdatacenterhasrunoutofspace.Aroomthatislocatednexttotheexistingdatacenteristhenusedtohousetworackscontainingsixservers.Sixmonthslater，physicalhousekeepingisperformedaspartofamid-yearmaintenanceplan.WhichenvironmentalconditiondiscoveredintheroomisLEASTcritical？（）