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【单选题】
十进制数39转换成二进制整数是A.
100011
B.
100101
C.
100111
D.
100001
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A.
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B.
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C.
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D.
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A.
are to challenge
B.
may be challenged
C.
have been challenged
D.
are challenging
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A.
Frames
B.
Segments
C.
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D.
bit streams
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A.
are to challenge
B.
may be challenged
C.
have been challenged
D.
are challenging
【单选题】The _______ layer is responsible for delivering data units from one station to the next without errors.
A.
physical
B.
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C.
trnsport
D.
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