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【单选题】
按照文件 系统层次标准一- File system Hierarchy Standard (FHS),在以下的目录中,哪一个目录对所有用户开放了全部权限? ( )A.
/etc
B.
/usr
C.
/var/run
D.
/var/lock
E.
/var/mail
F.
/etc/sysconfig
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举一反三
【简答题】Infrared radiation can produce heat________
【单选题】-- What can trees do _________ us ? --- They can _________ harmful gases and produce oxygen .
A.
helping , take in
B.
to help , take in
C.
helping , take out
D.
to help , take care
【单选题】Missouri can produce 10,000 tons of pecans per year or 5,000 tons of pears per year. Washington can produce 12,000 tons of pecans per year or 48,000 tons of pears per year. Which of the following stat...
A.
Washington has an absolute advantage in the production of both pecans and pears.
B.
Washington has a comparative advantage in the production of both pecans and pears.
C.
Washington has a comparative advantage in producing pecans and Missouri has a comparative advantage in producing pears.
D.
Both answers A and C are correct.
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