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?（）
A. Wattage
B. Amperage
C. Resistance
D. Voltage
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A. DVD-RW
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Which of the following types of software protection will help mitigate any threats coming fromworms or Trojans?（）
A. Spam blocker
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