问题 多项选择题

以下关于安全与危险的叙述中,正确的有( )。

A.一般用危险度来表示危险的程度

B.按照系统安全工程的认识论,安全和危险都是相对的

C.系统工程中的安全概念是任何事物中都包含有不安全因素

D.工程上的安全性,是用概率表示的近似客观量

E.在安全生产管理中,危险度用生产系统中事故发生的可能性与影响范围决定

答案

参考答案:A,B,C,E

解析: 一般用危险度来表示危险的程度。在安全生产管理中,危险度用生产系统中事故发生的可能性与严重性给出。按照系统安全工程的认识论,无论是安全还是危险都是相对的。工程上的安全性,是用概率表示的近似客观量,用以衡量安全的程度。系统工程中的安全概念,认为世界上没有绝对安全的事物,任何事物中都包含有不安全因素,具有一定的危险性。

单项选择题 B型题
单项选择题

Information systems design is defined as those tasks that focus on the specification of a detailed computer-based solution. Typically, there are four systems design tasks for in-house development.

①The first task is to specify (1), which defines the technologies to be used by one, more, or all information systems in terms of their data, processes, interfaces, and network components. This task is accomplished by analyzing the data models and process models that are initially created during requirements analysis.

②The next systems design task is to develop the (2). The purpose of this task is to prepare technical design specifications for a database that will be adaptable to future requirements and expansion.

③Once the database prototype has been built, the systems designer can work closely with system users to develop input, output and dialogue specifications. The (3)ust be specified to ensure that the outputs are not lost, misrouted, misused, or incomplete.

④The fourth design task involves packaging all the specifications from the previous design tasks into a set of specifications that will guide the (4) activities during the following phases of the systems development methodology.

Finally, we should (5) and update the project plan accordingly. The key deliverable should include a detailed plan for the construction phase that should follow.

(5)是()

A. adjust the project schedule

B. reevaluate project feasibility

C. evaluate vendor proposals

D. select the best vendor proposal