胎盘早剥的病因与下列哪一项无关()。
A.孕妇的血管病变
B.不协调的宫缩过强
C.子宫腔内压突然降低
D.外伤
E.行外倒转术纠正胎位
参考答案:B
A.打点计时器使用低压直流电源
B.打点计时器使用低压交流电源
C.使用打点计时器打出的纸带相邻两个点的时间间隔为0.02s
D.使用打点计时器打出的纸带相邻两个点的时间间隔为0.1s
Unfortunately, women were not admitted to university in the past, ______, nowadays, they have got equal rights.
A.while
B.when
C.as
D.since