单项选择题

Which of the following is a valid Class A TCP/IP address?（）

A.10.20.210.200
B.99.55.44.255
C.127.10.52.45
D.172.24.168.20

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When designing a PC, which of the following components would help a large application load theFASTEST?（）

A. Solid state drive
B. 1 MB L2 cache memory
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