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IP地址是Internet赖以工作的基础，它由网络地址和主机地址两部分组成，其中C类网络的主机地址数最多为（ ）。 A）64个 B）128个 C）256个 D）512个
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【单选题】Microsoft ended support for Windows XP after April 8, which _______a major operating system for some Chinese computer users, and advised users to upgrade to Windows 8.1.
A.
remained
B.
remains
C.
is remaining
D.
is remained
【单选题】It is not easy for a woman to _______ her career and family.
A.
balance
B.
separate
C.
match
D.
divide
【单选题】What action does Microsoft intend to take?
A.
To keep the code for its Windows operating system a secret.
B.
To design some new computer software.
C.
To persuade more PC users to adopt the Windows operating system.
【单选题】The essential difference between an operating system like Linux and one like Windows is that
A.
Windows can run with an Intel processor, whereas Linux cannot
B.
Linux is a proprietary whereas Windows is not
C.
There are multiple versions of Linux, but only one version of Windows
D.
Any programmer can modify Linux code which is not permitted with Windows
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