Last Sunday we watched          at the zoo.

A．an elephant show

B．elephant show

C．elephant's show

D．an elephant's show

下列哪一种显像剂可用于脑平面显像（）

A.⁹⁹Tc^m-ECD

B.⁹⁹Tc^mTcO₄^-

C.⁹⁹Tc^m-MIBI

D.⁹⁹Tc^m-HMPAO

E.⁹⁹Tc^m-植酸盐