一种指明逻辑记录位置的号码，用相对于基地址的差值来表示。

A number that indicates the location of a logical record, expressed as a difference with respect to a base address.

youdao

一种指明逻辑记录位置的号码，用相对于基地址的差值来表示。

A number that indicates the location of a logical record, expressed as a difference with respect to a base address.

youdao