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£ £ (61) The construct
£ £ cobegin
£ £ Statement1;
£ £ Statement2;
£ £ coend
£ £ means Statement1 and Statement2 are to be executed in parallel. The only two atomic actions in this construct are loading the value of a variable and storing into a variable. For the program segment
£ £ x:=0£»
£ £ y:=O£»
£ £ cobegin
£ £ begin
£ £ x:=l;
£ £ y:=y+x;
£ £ end;
£ £ begin
£ £ y:=2;
£ £ x:=x+3;
£ £ end
£ £ coend
£ £ Which of the following indicate(s) possible values for the variables when the segment finishes execution?
£ £ ¢ñ£®x=1,y=2
£ £ ¢ò£®x=1,y=3
£ £ ¢ó£®x=4,y=6
¡¡¡¡A£®¢ñ
¡¡¡¡B£®¢ñ and ¢ò C)¢ñ and ¢ó
¡¡¡¡D£®¢ò and ¢ó

¡¡¡¡(62) Software maintenance is to do necessary modification,supplenemt, and completeness during software life circle. Among the following vary kinds of maintenance,which one has the maximum workload in a general way?
¡¡¡¡A£®relevance maintenance
¡¡¡¡B£®completeness maintenance
¡¡¡¡C£®correctness naintenance
¡¡¡¡D£®other kinds of maintenance

£ £ (63) Different quality factors of software can be reflected upon user¡¯s different points of view,through product running,product modification and product transformation. Of the following properties,which one is connected with product running?
£ £ ¢ñ£®correctness ¢ò£®robustness ¢ó£®re-use
¡¡¡¡A£®¢ñonly
¡¡¡¡B£®¢òonly
¡¡¡¡C£®¢ñ+¢ò
¡¡¡¡D£®all of above

£ £ (64) Let R and S be the relation respectively:
£ £ Relation R: A B C Relation S: B C D
£ £  1 2 3 2 3 4
£ £  6 7 8 2 3 5
£ £  9 7 8 7 8 1
£ £ The number of tuples that the result of the expression R ¡Þ S (Here is the natural join of relations R and S) is
¡¡¡¡A£®3
¡¡¡¡B£®4
¡¡¡¡C£®6
¡¡¡¡D£®9

£ £ (65) Suppose we have the relation schema R(A,B,C,
¡¡¡¡D£®with functional dependencies;F{A¡úB,B¡úC,C¡úD,D¡úA},then R(A,B,C,D)at least is in
¡¡¡¡A£®1NF
¡¡¡¡B£®2NF
¡¡¡¡C£®3NF
¡¡¡¡D£®BCNF

£ £ (66) By means of multiple pipeline to carry out multiple processing,this technologyiscalled
¡¡¡¡A£®Multiple pipeling
¡¡¡¡B£®Superpipeline
¡¡¡¡C£®Superscalar
¡¡¡¡D£®Very long instruction word

£ £ (67) There are many page replacement algorithms in the page management. Most frequently used algorithm is
¡¡¡¡A£®FIFO
¡¡¡¡B£®PPT
¡¡¡¡C£®OPT
¡¡¡¡D£®LRU

£ £ (68) Layer n on one machine carries on a conversation with layer n on another machine. The rules and conventions used in this conversation are collectively known as the layer n
¡¡¡¡A£®topology
¡¡¡¡B£®protocol
¡¡¡¡C£®service
¡¡¡¡D£®peer

£ £ (69) Transport gateways connect byte streams in the transport layer. Application gateways allow interworking above
¡¡¡¡A£®network layer
¡¡¡¡B£®data link layer
¡¡¡¡C£®transport layer
¡¡¡¡D£®application layer

£ £ (70) Every host and router on the Internet has an IP address, which encodes its
¡¡¡¡A£®host number
¡¡¡¡B£®host number and socket
¡¡¡¡C£®network number
¡¡¡¡D£®host number and network number