包绕羊水的薄膜是()
A.胚外体腔
B.卵黄囊
C.羊膜
D.绒毛膜
E.底蜕膜
参考答案:C
若样本k1,…,k10的方差为6,则样本3(k1﹣1),3(k2﹣1),…,3(k10﹣1)的方差为( )。
We hoped to be able to move into our new house at the end of the month , but things didn’t as we expected .
A.work out
B.move out
C.carry out
D.get out