单项选择题
The user turns on the computer and hears a popping sound and detects a burning smell. Thesystem will not power on. Which of the following is the MOST likely problem?（）
A. Power supply has blown. B. CPU fan is faulty. C. Motherboard has overheated and shutdown. D. UPS has been tripped.
单项选择题 Hyperthreading technology:（）
单项选择题 Which of the following devices would MOST likely require a serial adapter to be installed on amodern PC?（）
单项选择题 Which of the following broadband types can provide the MOST available bandwidth?（）
