正常人伊红染色,精子活动率应大于()
A.55%
B.65%
C.75%
D.85%
E.95%
参考答案:C
All we have is 24 precious hours a day and therefore we shall waste ______
A.nothing
B.none
C.neither
D.no one
哪些计算机接受侧杆的指令()
A.仅ELACS
B.ELACS和SECS
C.FCDCS
D.SFCC