软件维护工作越来越受到重视，因为维护活动的花费常常要占用软件生存周期全部花费的(14)%左右，其工作内容为(15)。为了减少维护工作的困难，可以考虑采取的措施为(16)。

(52)

(62)

(60)

(61)

(57)

An Intranet is(71)the application of Internet technology within an internal or closed user group．Internets are company(72)and do not have a(73)connection to the Internet．Used properly an Internet is highly effective corporate tool，capable of regularly(74)information to empower the workforce with the information needed to perform. their roles．Used in this way，Internet represent a step towards the(75)office．

(58)

(59)

在UML提供的图中，可以采用(30)对逻辑数据厍的建模；(31)用于接口、类和协作的行为建模，并强调对象行为的事件顺序；(32)用于系统的功能建模，并强调对象之间的控制流。

(55)

(56)

(53)

(54)