出现产后出血不易被立即发现的是（）
A.胎盘嵌顿
B.胎盘滞留
C.胎盘植入
D.胎盘粘连
E.胎盘剥离不全
参考答案：A
本金=利息+时间．______．（判断对错）
—The light in the office is still on.
—Oh, I forgot _____. [ ]
A. turning it off
B. turn it off
C. having turned it off
D. having turned it off
