单项选择题 Which of the following characteristics must be matched depending on the specifications of thepower grid for the country a PSU will be utilized in?（）

单项选择题 An optical disc with a 4.7GB MAXIMUM storage capacity is likely which of the followingtechnologies?（）

单项选择题 Which of the following types of software protection will help mitigate any threats coming fromworms or Trojans?（）