Which function is used to lock a file in FoxPro DBMS

A．FLOCK( )

B．RLOCK( )

C．LOCK( )

D．LOCK

可作为桥血管实施高流量搭桥术的血管是（）

A.桡动脉

B.颞浅动脉

C.枕动脉

D.隐静脉

E.颌内动脉