多选题Which two commands allow you to return to a previous verision of software on the device?（）Arequest sytem software addBrequest sytem software downgradeCrequest sytem software replaceDrequest sytem software rollback

Software is divided into two categories，system software and application software．Please choose one which is differ from other three

A．WindOws 98

B．Word 2000

C．C++compiler

D．FoxBase DBMS

A. request sytem software add

B. request sytem software downgrade

C. request sytem software replace

D. request sytem software rollback

●As an important phase in software development，software design is the continuation of software requirement analysis phase． (69) ．

Ⅰ．software structure

Ⅱ．software document

Ⅲ．software module

Ⅳ．software procedure

Which of the following should be included in software design phase?

(69) A．Ⅱ andⅢ

B．Ⅰ andⅡ

C．Ⅰ，Ⅱ andⅢ

D．All

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

(73)

A. database

B. system

C. operating

D. text

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

A.system B.I/O C.control D.database

______ is a set of specifications and software that allow small programs or software components to work together.

A．ActiveX

B．XML

C．HTML

D．DBMS

A software requirements specification is that () .

A.a rough list of things that the proposed software ought to do

B.a precise list of things that the proposed software ought to do

C.a formal list of things that the proposed software must do

D.an estimate of the resouroes (time, money, personnel, etc) which will be required to construct the proposed software

As an important phase in software development, software design is the continuation of software requirement analysis phasE．

Ⅰ．software structure

Ⅱ．software procedure

Ⅲ．software module

Ⅳ．software document

which of the following should be included in software design phase?

A．Ⅰand Ⅱ

B．Ⅱand Ⅲ

C．Ⅰ,Ⅱ and Ⅲ

D．All

Software Engineering Economy is an effective part of software engineering.Which of the following content is the research content of software engineering economy?

Ⅰ.Estimation of software development cost

Ⅱ.Earn & Cost analysis of software development

Ⅲ.Adjustment of software development progress

A．Ⅲ only

B．Ⅱ and Ⅲ

C．Ⅰ and Ⅱ

D．all