对人员控制最常用的方法是( )。A．面谈B．观察C．直接巡视D．考核

以下哪一项不是临床上根管预备的终止点（）

A.生理性根尖孔

B.根尖止点

C.根尖基点

D.牙本质牙骨质界尖台

E.解剖性根尖孔

---Nowadays more and more people move to cities because there are better job opportunities.

---I don’t agree. Most of them remain unemployed, cannot afford housing and eventually __ living in poverty.   

A．finish up

B．take up

C．end up

D．put up

下列各组原子序数所表示的两种元素，能形成A₂B型离子化合物的是 [ ]

A．6和16         

B．11和13        

C．11和16           

D．12和17