单项选择题 A user’s laptop does not produce sound even though the volume settings are at maximum in theoperating system. Which of the following would MOST likely resolve this issue?（）

单项选择题 When adding a FireWire adapter to a laptop, which of the following ports would MOST likely beused? （）

单项选择题 After installing a new optical drive into a workstation, which of the following will ask for anacknowledgement?（）