对于港口噪声一般以（）作为噪声源评价量。

A.倍频带声压级

B.声功率级

C.等效连续A声级（LAeq）

D.A计权声功率级

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