下列选项中，表明x与y具有正相关关系的有

A．x与y的相关系数为0.85

B．x对y的回归系数为1.25

C．x与y的相关系数为-0.85

D．x对y的回归系数为-1.25

E．y对x的回归系数为0.55

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.

（71）处填（）。

A．accessed

B．moved

C．read

D．wrote