单项选择题
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
多项选择题 Which of the following drive connections uses a ribbon cable with a 40-pin connector?（）
多项选择题 Which of the following are potential sources of EMI?（）
单项选择题 Which of the following memory modules uses a 240-pin connector?（）
