单项选择题
A.1/2 B.1/4 C.1/6 D.1/8 E.1/10
A.<0.04s B.<0.06s C.<0.08s D.<0.10s E.<0.12s
A.1/2 B.1/3 C.1/4 D.1/5 E.1/6
A.0.04～0.08s B.0.04～0.10s C.0.06～0.10s D.0.08～0.10s E.0.08～0.12s
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