单项选择题
A.0.1m/m B.0.125m/m C.0.15m/m D.0.2m/m
A.80% B.85% C.90% D.95%
A.30Ω B.40Ω C.50Ω D.60Ω
A.0.5km/h B.1km/h C.1.5km/h D.2km/h
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