国际咨询工程师联合会简称（）。A.FIDIC B.FIDIA C.ELDlC D.F

下列关于精液说法错误的是（）

A.正常精液量为2～6ml

B.正常精液pH为7.0～7.8

C.室温放置30分钟内液化

D.精子密度（20～200）×10g/L

E.正常形态精子占50%

 Year 3 Students in our school _______ all kinds of exercises every day in the past eight months.

A. kept busy doing             B. keep busy with doing 

C. were kept busy doing          D have been kept busy with

—             is your mother? 

— A nurse. [ ]

A. Who

B. What

C. Where

D. How

当知道客人将客房作新婚之用时怎么办？

滤模器的作用是滤除光纤传导模中的（）。

A.包层模

B.基模

C.高阶模

D.稳态模