Electronic mail systems are either computerized or noncomputerized. Important among the computerized systems are the (15)_________________ones organized into (16)____________of various sizes. Most noncomputerized electronic mail system such as (17)________________units of various kinds are simple, turnkey systems that require little effort to (18)_____________. Though often of value in (19)_______________applications, these systems have only interim(间歇) worth in office automation unless they can be electronically integrated.
Communication in an EMS is either synchronous or nonsynchronous. People involved in synchronous communication must (20)______________________________________________________________________, such as (21)__________________________________________________. A nonsynchronous system (22)_________________________________at different times.
Electronic systems output soft copy or hard copy. Soft copy (23)__________________________, but many applications will (24)_________________.
【参考答案】
is preferred for its ease of manipulation and reduction in p......