2. 计算机
  3. The　data　station　usually　means　a(71)unit　that　provides　data　for　transmission,　that　accepts　transmitted　data,　and　that　performs　a

The　data　station　usually　means　a(71)unit　that　provides　data　for　transmission,　that　accepts　transmitted　data,　and　that　performs　a

admin2010-01-23  73
问题 The　data　station　usually　means　a(71)unit　that　provides　data　for　transmission,　that　accepts　transmitted　data,　and　that　performs　all　functions　necessary　for　communication　with　another　functional　unit.　Data　stations　may　be　divided　into　two　kinds,　the　primary　stations　and　the　secondary　stations,　(72)control　functions.In(73)data　link　control,　the　primary　station　is　the　data　station　that　supports　the　primary　control　functions　of　the　data　link,　generates　commands　to　be　transmitted,　and　interprets　received　responses.　Specific　responsibilities　assigned　to　the　primary　station　include　initialization　of　control　signal　interchange,　organization　of　data　flow　and　actions　regarding　error　control　and　error　recovery　functions.　The　secondary　station　executes　data　link　control　functions　as　(74)by　the　primary　station,　interprets　received　commands　and　(75) responses　to　be　transmitted.
选项 A、advanced
B、up-to-date
C、top-level
D、high-level
答案D
解析
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