單項(xiàng)選擇題正常人精液排出后60分鐘內(nèi),a和b級(jí)精子的總和應(yīng)大于()

A.25%
B.60%
C.50%
D.70%
E.80%


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2.單項(xiàng)選擇題有生育力的男性精子存活率應(yīng)()

A.≥50%
B.≥60%
C.≥70%
D.≥75%
E.≥80%

4.單項(xiàng)選擇題正常精液液化時(shí)間不超過()

A.5min
B.60min
C.20min
D.30min
E.10min

5.單項(xiàng)選擇題正常精液剛液化時(shí),pH值為()

A.5.5~6.0
B.6.2~6.6
C.6.8~7.2
D.7.2~7.8
E.8.0~8.3