【多选题】Which of the following correctly describe steps in the OSI data encapsulation process?()
A.
Transport layer divides a data stream into segments & adds reliability & flow control information
B.
Data link layer adds physical source & destination address & an FCS to the segment
C.
Packets are created when the network layer encapsulate a frame with source & destination host address& protocol related control information
D.
Packets are created when the network layers adds layers 3 address & control information to a segment
E.
The presentation layer translated bits into bits into voltages for transmission across the physical link
【单选题】下列选项中,不属于商务部可以采取的反倾销措施的是( )。
【单选题】Data flow into the computer is ______.
【简答题】排列与组合的概念有什么共同点吗?有什么不同点?
【单选题】When drawing multilevel data flow chart of top-down,the balance between parent chartand son chart must be taken into account,and to pass iudgment for the balance of the charts isregulaly maintained by...
【判断题】当Y=2~5时,沿着金属主要伸长方向呈碎粒状或链状分布,塑性杂质则随着金属变形沿主要伸长方向呈带状分布,具有一定的方向性,通常称为锻造流线。
【单选题】Data flow into the computer as _______.
【简答题】元素周期表中第三周期相邻的三种主族元素X、Y、Z的第一电离能的大小与原子序数的关系如图所示。 (1)元素X的原子结构示意图是_______。 (2)元素Y的基态原子的电子排布式是______________。 (3)元素Z的最高价氧化物对应的水化物的化学式为___________。 (4)下列有关X、Y、Z三种元素的比较中符合上图递变趋势的还有_______(填字母)。 A.原子半径 B.最高正价...
【多选题】Which of the following correctly describe steps in the OSI data encapsulation process?()
A.
The transport layer divides a data stream into segments and may add reliability and flow control information.
B.
The data link layer adds physical source and destination addresses and an FCS to the segment.
C.
Packets are created when the network layer encapsulates a frame with source and destination host addresses and protocol-related control information.
D.
Packets are created when the network layer adds Layer 3 addresses and control information to a segment.
E.
The presentation layer translates bits into voltages for transmission across the physical link.
【简答题】A. Difficultyof changing one’s immigration status. B. Extent of error in card completion. C. Classification of border-crossers. D. Uncertainty in categorization. E. Computer-assi...