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.
A.performance
B.functional
C.capacity
D.quality
第1题:
In(71)programming,the user determines the sequence of instructions to be executed,not the programmer.
A.top-down
B.structure
C.data-driven
D.event-driven
第2题:
Project(71)is an uncertain event or condition that,if it occurs,has a positive or a negative effect on at least one project objective,such as time,cost,scope,or quality.
A.risk
B.problem
C.result
D.data
第3题:
在有13个元素构成的有序表data[1..13]中,用折半查找(即二分查找,计算时向下取整)方式查找值等于data[8]的元素时,先后与(41)等元素进行了比较。
A.data[7]. data[6]. data[8]
B.data[7]. Data[8]
C.data[7]. data[10]. data[8]
D.data[7]. data[10]、data[9]. data[8]
第4题:
A firewall is a(71)system designed to(72)an organization's network against threats.
A.operating
B.programming
C.security
D.data
第5题:
One use of networks is to let several computers share(71)such as file systems, printers, and tape drives.
A.CPU
B.memory
C.resources
D.data
第6题: