单项选择题

A user has purchased a laptop that has no means to charge the battery. Which of the followingwould the user MOST likely purchase?（）

A. USB cable
B. AC adapter
C. PCMCIA card
D. Replacement battery

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单项选择题
Which of the following is the NEXT step in the troubleshooting theory after identifying the problem?（）

A. Establish a theory of probable cause
B. Test the theory
C. Implement preventative measures
D. Establish a plan of action
多项选择题
Which of the following network connections would use a standard POTS line to both send andreceive Internet packets?（）

A.Dial-up
B.DSL
C.Satellite
D.OC3
E.T1
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