胎儿腹围应在什么水平测量（）。
A.胎儿肾脏
B.胎儿心脏
C.胎儿胆囊
D.胎儿肝内门脉左支和胃
E.脐带入腹壁处
参考答案：D
Did you know _____ at the bus stop? Maybe their teacher. [ ]
A. who are they waiting for
B. whom they are waiting for
C. whom they were waiting fot
急性肾衰竭的发生机制中"超滤液回漏"是由于（）
A.肾小管阻塞
B.超滤液流速过慢
C.肾小管上皮细胞坏死脱落
D.肾小管受压
E.肾小球滤过率降低
