A.50m B.100m C.5m D.30m
A.几兆 B.几十兆 C.几百兆 D.几千兆
A.0.1 B.0.2 C.0.5 D.1.0
A.50 B.60 C.30 D.20
A.5 B.10 C.12 D.15
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