【名词&注释】
正常值(normal value)、凝血因子(coagulation factor)、阴道清洁度(vaginal cleaning graduation)、外周血血小板(peripheral blood platelet)、血友病甲(hemophilia a)、清洁度检查(cleanliness inspection)
[单选题]精子计数正常值和致孕的低限分别是()
A. (50~100)×10/L,20×10/L
B. (100~300)×10/L,40×10/L
C. (80~120)×10/L,20×10/L
D. (150~200)×10/L,100×10/L
E. (80~100)×10/L,60×10/L