Did Tom study at No. 8 Middle School three years _______?

A．ago

B．after

C．before

D．then

哪种病变不属于神经元基本病变

A.急性坏死 

B.包涵体形成 

C.Waller变性 

D.中央性Nissl小体溶解 

E.神经纤维缠结