单选题Which of the following components of a laptop is NOT upgradeable?（）A Ethernet LAN cardB MotherboardC Hard diskD RAM
题目
单选题
Which of the following components of a laptop is NOT upgradeable?（）
A
Ethernet LAN card
B
Motherboard
C
Hard disk
D
RAM
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参考答案和解析
正确答案：
B
解析：
暂无解析