单项选择题
A. only works on computer systems with multiple core CPUs.
B. enables a processor to work with two independent computer instructions at once.
C. enables two independent processors to work on the same task, simultaneously.
D. allows a computer program to work on multiple tasks simultaneously.
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?（）
单项选择题 A user reports that their UPS is making a loud beeping sound. Which of the following would cause this problem?（）