培训地点的选择主要考虑（），应当有利于培训的有效实施。

A.培训的时间

B.培训的内容

C.培训的方式

D.培训的效果

The relational database model requires the data be (71) through programs that don’t rely on the position of the data in the database. This is in direct (72) to the other database mode, where the program has to follow a series of pointers to the data it seeks. A program (73) a relational database simply asks for the data it seeks; the DBMS performs the necessary searches and (74) the information. The (75) on how the search is done are specific to the DBMS and vary from product to product.

（74）处填（）。

A．erases

B．provides

C．proves

D．values