位于膝关节囊前壁的是（）E．

A. He is an expert of car sales.
B. He is a mechanic of cars.
C. He is the owner of the ear.
D. He is an inspector.

A. PA＞PB NA＞NB
B. PA=PB NA＜NB
C. PA=PB NA＞NB
D. PA＜PB NA＜NB