淋巴显像所用核素为()
A.99mTc-SC
B.99mTc-MIBI
C.99mTcO3-
D.99mTc-DTPA
E.201TlCl
参考答案:A
下列根管预备的目的中,哪一条不是事实()
A.扩大根管便于根管消毒
B.消除感染源
C.扩大根尖孔,以利引流
D.减少弯曲根管的弯曲度
E.预备根管形态,以利充填
People have planted a great many trees in order to________wind and sand in the desert.[ ]
A.hold down
B.hold up
C.hold back
D.hold out