问题
单项选择题
Which of the following would not be an indication of placental detachment（）
A. An abrupt lengthening of the cord.
B. An increase in the number of contractions.
C. Relaxation of the uterus.
D. Increased vaginal bleeding.
答案
参考答案：C
解析：
Relaxation isn’t an indication for detachment of the placenta. An abrupt lengthening of the cord, an increase in the number of contractions, and an increase in vaginal bleeding are all indications that the placenta has detached from the wall of the uterus.