正常精子中畸形精子,一般不应超过()。液态精液输精镜检活率不低于()。冻精解冻后镜检活率不低于()。
参考答案:20%;50%;30%
It was not I but you who the first to run to the goal in that competition.
A.is
B.was
C.are
D.were
假期、节日、社会保障等属于激励性报酬。