进行性交后精子穿透力试验的最佳时间是()
A.两次月经中间
B.月经来潮一周或月经来潮6小时内
C.月经干净后3~7天内
D.排卵日
E.非经期的任何日期
参考答案:D
_________, I always feel I want a few more days.
A.However long is a vacation
B.However long a vacation is
C.However is a vacation long
D.However a vacation is long
预应力锚杆是将拉力传递到稳定岩层或土体的锚固体系。