填空题

Electronic mail systems are either computerized or noncomputerized, important among the computerized systems are. The (S1)________ones organized into (S2)___________of various sizes. Most noncomputerized electronic mail system such as (S3)________units of warious kinds are simple, turnkey systems that require little effort to (S4)_________. Though often of value in (S5)____________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 be (S6)________at the same absolute time, such as during a (S7)_______ call. A nonsynchronous system(S8)____________________________________________________at different times. Electronic systems output soft copy or hard copy. Soft copy (S9)_______________________________, but many applications will (S10)_____________________________________. S1