单项选择题
When comparing DSL broadband to cable broadband, which of the following is an advantage ofDSL broadband?（）
A. Upgraded copper lines allow maximum speed greater than cable
B. Signal is not shared back to the switch
C. Signal is shared back to the switch
D. Distance is not a factor in signal speed
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A technician is dispatched to install additional RAM in a computer. The technician unplugs thesystem from the power source, and removes the cover of the PC. Which of the following shouldthe technician do NEXT?（）
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A technician is dispatched to a location. While working, the technician’s cell phone rings. Which of the following actions should the technician take?（）
A. Answer the call to determine its importance.
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C. Answer the call and leave the location in order to talk.
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