2. 计算机
  3. In　data　communication,　data　link　is　those　parts　of　two　data　terminal　equipments　that　are　controlled　by　a　protocol　along　with　the

In　data　communication,　data　link　is　those　parts　of　two　data　terminal　equipments　that　are　controlled　by　a　protocol　along　with　the

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问题 In　data　communication,　data　link　is　those　parts　of　two　data　terminal　equipments　that　are　controlled　by　a　protocol　along　with　the(71) data　circuit,　which　together　enable　data(72).　So-called　protocol　means,　in　short,　a　set　of　rules　that　determines　the　behavior　of　functional　units　in　achieving　communication.Data　circuit,　however,　consists　of　a　pair　of(73) transmission　channels　that　provides　a　means　of　two-way　data　transmission.　Between　data　switching　exchanges,　the　data　circuit　may　or　may　not　include　data　circuit-terminating　equipment (DCE),　depending　on　the　type　of(74) used　at　the　data　switching　exchange.　Between　a　data　station　and　a　data　switching　exchange　or　data　concentrator,　the　data　circuit　includes　the　DCE　at　the　data　station　end,　and　may　include　equipment(75) to　a　DCE　at　the　data　switching　exchange　or　dam　concentrator　location.
选项 A、interface
B、port
C、window
D、entrance
答案A
解析
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