证券登记结算公司的保证交收，降低了证券市场的交易风险，提高了运作效率，也在一定程度上降低了市

Software()activities consume a large portion of the total life-cycle budget．

A．repair

B．maintenance

C．change

D．update

Software()activities consume a large portion of the total life-cycle budget．

A．repair

B．maintenance

C．change

D．update

Enhancing a software product may consume(73)percent of the total life-cycle effort.

A．80

B．30

C．50

D．42

● __(73)__ are the four major activities of software configuration management.

①configuration identification ②statement report ③change control

④preparation of requirement document ⑤configuration auditing

（73）A．①②③④ B．①②④⑤ C．①②③⑤ D．②③④⑤

● __(73)__ are the four major activities of software configuration management.

①configuration identification ②statement report ③change control

④preparation of requirement document ⑤configuration auditing

（73）A．①②③④ B．①②④⑤ C．①②③⑤ D．②③④⑤

●Generally software can be divided into two types: (73) software and application software.

(73)

A. database

B. system

C. operating

D. text

Consumption of the total life-cycle effort in software maintenance is(73)that in software development.

A．less than

B．larger than

C．equal or less than

D．equal or larger than

Without systems software, application software in a computer is(73)

A．nouse

B．useful

C．useness

D．useless

Without systems software, application software in a computer is(73)

A．nouse

B．useful

C．useness

D．useless

Enhancing a software product may consume(23)percent of the total life-cycle effort.

A．80

B．30

C．50

D．42