精子的去能
参考答案：
指获能的精子若再次与精清接触而又失去受精能力的过程。
She treated the boy very well _____he were her own child. [ ]
A. as though
B. unless
C. even though
D. as long as
混凝土灌注桩质量检验，下列项目中属于主控项目的是（）
A.桩体质量
B.垂直度
C.桩径
D.泥浆比重
