单项选择题
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
A.0.08～0.11s B.0.08～0.20s C.0.12～0.16s D.0.12～0.20s E.0.16～0.24s
A.<0.25mV B.<0.2mV C.<0.3mV D.<0.15mV E.<0.1mV
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