多项选择题
Which of the following are impact printers?（）
A. Line printer B. Dot matrix printer C. Thermal transfer printer D. Inkjet printer E. Xerographic printer
单项选择题 Which of the following is the MOST likely default configuration for a serial port?（）
单项选择题 Which of the following BEST describes the function of hyperthreading support within a CPU?（）
多项选择题 Which of the following are supported bus widths for a PCIe bus slot?（）
