(单选题)39: 就精子数量而言,下列具有正常生育能力的指标是
A: 精子数在2000万~3000万/ml
B: 精子数在3000万~4000万/ml
C: 精子数在4000万~5000万/ml
D: 精子数在5000万~6000万/ml
E: 精子数在>6000万/ml
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