单项选择题
What is the FIRST step in diagnosing a completely dead computer that was working fine the day before？（）
A.remove all peripherals and reinstall them one at a time B.replace the CMOS battery C.check the AC power cord and verify the power source D.back up the entire hard drive
单项选择题 Wherearethefirstcomputerinstructionsavailablewhenamicrocomputerispoweringup？（）
单项选择题 WhatistheMOSTsignificantdifferencebetweenEDORAMandfastpagemodeDRAM？（）
单项选择题 WhatisthestandardIRQforthekeyboard？（）
