单项选择题
Which of the following memory modules is a DDR3 chip?（）
A. PC-3200 B. PC2-4800 C. PC2-5300 D. PC3-8000
单项选择题 The last step in resolving an end user ticket should be which of the following?（）
单项选择题 Which of the following types of printers uses a fuser to print a document?（）
单项选择题 The most important customer a technician has is:（）
