单项选择题
A.Note on the work order that the laptop is losing battery capabilities and the laptop must be replaced.
B.Replace the battery by purchasing a new battery from the manufacturer.
C.Stop using the battery and use alternating current （AC） power for the laptop.
D.Replace the AC adaptor by purchasing a new adapter from the manufacturer.
单项选择题 Whichofthefollowingwouldbethesafestenvironmentalconditionforworkingonmultiplesystemsatonetime？（）
多项选择题 Whichofthefollowingcanbeusedtodeterminetheamountofphysicalmemoryinstalledinalaptop？（）
单项选择题 Atechnicianreceivesacomputerforrepairandobservesthatthefanonthepowersupplyisnotmoving.Whichofthefollowingshouldthetechniciando？（）