单项选择题
A user reports that their onboard RJ-45 jack is damaged and will no longer function. Which of the following will provide this jack as an alternative to replacing the motherboard?（）
A. Install a USB serial adapter
B. Connect to a USB hub
C. Use an external modem
D. Use an Ethernet card
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A. Cable tester
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单项选择题
Which of the following tools can be used to test if a 24-pin power cable is outputting correct voltage?（）
A. Cable tester
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