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【单选题】
一有髓神经纤维动作电位的锋电位持续时间约2毫秒,从理论上讲,它1秒内所产生的动作电位次数不可能超过多少次A.
100
B.
200
C.
300
D.
400
E.
500
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【简答题】unit2-listen A.mp4
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