单项选择题
A.A B.C C.S D.D
A.4.0m～5.0m B.5.0m～5.5m C.5.5m～6.0m D.6.0m～6.5m
A.1023bit B.1025bit C.1045bit D.1075bit
A.256 B.341 C.456 D.525
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