Assessment of a client in active labor reveals meconium-stained amniotic fluid and fetal heart sounds in the upper right quadrant. Which of the following is the most likely cause of this situation

A．Breech position.

B．Late decelerations.

C．Entrance into the second stage of labor.

D．Multiple gestation.

关于脑脊液细胞计数，错误的是 （）

A.增加计数容积，可以减少计数误差

B.细胞玻片离心沉淀仪可比一般离心法收集的细胞多

C.细胞数少时，应使用Fuchs-Rosenthal计数板计数

D.正常脑脊液细胞以中性粒细胞为主

E.血性脑脊液白细胞计数结果应进行校正