从胎儿娩出到胎盘娩出,不应超过()
A.15分钟
B.20分钟
C.30分钟
D.45分钟
E.60分钟
参考答案:C
Visitors to the hills are greeted by signs them to look out.
A.warn
B.to warn
C.warning
D.warned
触电者失去知觉(假死)时,人工抢救的要点是什么?