OOP languages that create objects, such as (1) and (2) are beginning to take hold as viable tools for programmers. To effectively reuse objects, programmers need a place to store them such as an ODBMS or a RDBMS with object oriented extensions.

Databases that handle object data not only let user store and retrieve (3) data, but also let them store objects created by OOP languages, to facilitate rapid software development and reuse, and let them (4) new multimedia applications combining multiple data types.

RDBMS vendors have developed new extensions to existing DB technology to accommodate the most common forms of (5) data.

（2）是（）

A.C++

B.SMALLTALK

C.PASCAL

D.C

目前对运动强度监控的主要指标是什么，心率可以作为辅助指标（）。

A.血乳酸

B.运动负荷

C.血色素

D.血尿素