单选题Which of the following is a characteristic of a serial I/O port?（）ARJ-11 connectorBDB-15 connectorCDB-9 connectorDRJ-45 connector
单选题
Which of the following is a characteristic of a serial I/O port?（）
A
RJ-11 connector
B
DB-15 connector
C
DB-9 connector
D
RJ-45 connector
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