【名词&注释】
潮气量(tidal volume)、体外受精(in vitro fertilization)、低血压(hypotension)、同源人工授精(artificial insemination by husband)、异源人工授精(artificial insemination by donor)、无性生殖(asexual reproduction)、时间肺活量(time vital capacity)
[单选题]婴儿骶管的容积是( )
A. 2~5ml
B. 6~8ml
C. 9~12ml
D. 13~15ml
E. 16~20ml