胎儿在几周时听觉神经已经开始发育了？

A.妊娠12-16周

B.妊娠18-20周

C.妊娠22-24周

D.妊娠25-26周

A.1-2周

B.3-4周

C.5-6周

D.0.5周

A.20

B.24

C.28

D.36

E.40

A.孕10-12周

B.孕14-16周

C.孕28-30周

D.孕32-34周

A.半个脉冲周期内完成

B.一个脉冲周期内完成

C.十个脉冲周期内完成

D.整个加工时间内完成

A.Select * From Student Where Sname like '周%'

B.Select * From Student Where Sname like '%周'

C.Select * From Student Where Sname like '_周'

D.Select * From Student Where Sname like '周_'