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.
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