单项选择题

Which of the following has the HIGHEST connection latency? （）

A.Satellite
B.Cable
C.DSL
D.Dial-up

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单项选择题

Which of the following commands changes a file characteristic so that it cannot be seen with astandard directory query? （）

A. attrib file.txt +h
B. attrib file.txt +r
C. ren file.txt
D. attrib file.txt +s

单项选择题

Which of the following attributes is set when a file is ready to be backed up?（）

A.a
B.h
C.r
D.s

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