多项选择题
When a computer does not recognize an internal modem， a technician should determine whether：（）
A.the modem is seated properly.
B.the number being dialed is valid.
C.there are resource conflicts.
D.there is power to the modem.
E.the modem speaker is enabled.
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A.Download free anti-virus programs from the Internet.
B.Perform updates from the manufacturers website regularly.
C.Using the operating systems email program only to open attachments.
D.Monitoring what is displayed on the screen. -
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A.RAID 1
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Whichofthefollowingshouldbeconsideredwhenupgradingmemory？（）
A.speed of memory
B.memory slot color
C.type of memory
D.CPU speed
E.BIOS version
