以下哪些方法可以用来判断蓄电池的存电状况？（）

A.用玻璃管测量电解液液面高度

B.用密度计检查电解液的密度

C.用高率放电计测量发电电压

D.用万用表来测量启动电压

Prior to the availability of enterprise EDM, locating a document over a LAN could be difficult, and over a WAN (1) nearly impossible. With the model for collaborative work spreading, and with more users sharing (2) documents through e-mail and the Internet, enterprise EDM had become a necessity.

Many businesses are finding their greatest competitive advantage is the ability to harness the document (3) lifecycle. EDM systems manage this lifecycle from creation, revision, storage and (4) retrieval to routing and workflow. They also allow users to work on documents collaboratively.

Reusability of information is EDM’s main benefit, as well as the key to creating the paradigms that drive business process (5) reengineering.

4（）

A．retrieval

B．route

C．path

D．save