单选题Which of the following tools should Mike, a technician, use when testing a serial port?（）ACable testerBMultimeterCLoopback plugDLogic probe
单选题
Which of the following tools should Mike, a technician, use when testing a serial port?（）
A
Cable tester
B
Multimeter
C
Loopback plug
D
Logic probe
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解析：
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