下列放射性药物不用于甲状腺显像的是()。
A.131I
B.123I
C.201T1
D.99mTcO4-
参考答案:C
颈椎的特有结构是()
A.椎体
B.椎板
C.横突孔
D.上关节突
E.下关节突
The purpose of new technologies is to make life easier, _______ it more difficult. [ ]
A. not make
B. not to make
C. not making
D. do not make