单项选择题
Which of the following memory types is unique in that it generates so much heat it requires that the memory modules are covered in heat sinks?（）
A.RAMBUS
B.DDR3
C.DDR
D.SDRAM
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A. Surge protector
B. UPS
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单项选择题
Which of the following is the subnet mask for a Class C IP address?（）
A.10.0.0.1
B.192.168.1.1
C.255.255.0.0
D.255.255.255.0 -
单项选择题
Which of the following is the IPv6 loopback address?（）
A.：：1
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