某电场的电场线如右图所示，则某点电荷在A点和B点所受电场力的大小关系是（  ）

A．F_A>F_B

B．F_A<F_B

C．F_A=F_B　

D．电荷正负不明无法判断

The relational database model requires the data be (110) through programs that don’t rely on the position of the data in the database. This is in direct (111) to the other database mode, where the program has to follow a series of pointers to the data it seeks. A program (112) a relational database simply asks for the data it seeks; the DBMS performs the necessary searches and (113) the information. The (114) on how the search is done are specific to the DBMS and vary from product to product.

（110）是（）

A.accessed

B.moved

C.read

D.wrote