20051989的末二位数字是（ ）
A．15
B．25
C．45
D．55
答案：B
I didn't know ____ I was supposed to do.[ ]
A. when
B. what
C. how
D. where
女性，28岁。孕36周，产前检查胎背位于母体腹部左侧，胎心位于左上腹，宫底可触及浮球感，诊断胎方位为
A．LDA
B．LOT
C．BSA
D．LSA
E．LOP
