单项选择题
A.5s-8s B.5s-10s C.4s-8s D.4s-12s
A.0.4 B.0.45 C.0.5 D.0.55
A.5 B.10 C.15 D.20
A.0.05 B.0.1 C.0.15 D.0.2
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