Your portable computer has two 512-MB memory modules installed in the only two memory slots available. You need to improve the speed of your computer. What should you do?（） 
- A、A
- B、B
- C、C
- D、D
正确答案:B
答案解析:有
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Your portable computer has two 512-MB memory modules installed in the only two memory slots available. You need to improve the speed of your computer. What should you do?（）
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