六年级一班昨天两人因病请假一天，早上出勤率正好是96%，到下午时，又有1名同学因事请假，下午的出勤率是（ ）%。
94
Which of the following functions would the nurse expect to be unrelated to the placenta
A．Production of estrogen and progesterone.
B．Detoxification of some drugs and chemicals.
C．Exchange site for food, gases, and waste.
D．Production of maternal antibodies.
某斗容量1m3正铲挖土机的机械台班产量为4．96（定额单位100m3），小组成员两人，则挖100m3土的人工时间定额为（）工日。
A．0.40
B．4.96
C．2.48
D．0.20
