单项选择题
A.0.04 B.0.08 C.0.16 D.0.32
A.0.8~1s B.3~5s C.7~9s D.10~15s
A.0.1 B.0.3 C.0.5 D.0.7
A.0.1 B.0.25 C.0.45 D.0.6
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