问题 单项选择题

在软件质量特性中, (53) 是指在规定的一段时间和条件下,与软件维持其性能水平的能力有关的一组属性; (54) 是指防止对程序及数据的非授权访问的能力。
供选择的答案

A.安全性
B.适应性
C.灵活性
D.容错性

答案

参考答案:A

解析: 根据ISO/IEC 9126软件质量模型,在规定的一段时间和条件下与软件维持其性能水平的能力有关的一组属性被称为可靠性,防止对程序及数据的非授权访问的能力被称为安全性。

单项选择题 B1型题
单项选择题

Most people would be (1) by the high quality of medicine (2) to most Americans. There is a lot of specialization, a great deal of (3) to the individual, a (4) amount of advanced technical equipment, and (5) effort not to make mistakes because of the financial risk which doctors and hospitals must (6) in the courts if they (7) things badly.

But the Americans are in a mess. The problem is the way in (8) health care is organized and (9) . (10) to pubic belief it is not just a free competition system. The private system has been joined a large public system, because private care was simply not (11) the less fortunate and the elderly.

But even with this huge public part of the system, (12) this year will eat up 84.5 billion dollars—more than 10 percent of the U. S. Budget—large number of Americans are left (13) . These include about half the 11 million unemployed and those who fail to meet the strict limits (14) income fixed by a government trying to make savings where it can.

The basic problem, however, is that there is no central control (15) the health system. There is no (16) to what doctors and hospitals charge for their services, other than what the public is able to pay. The number of doctors has shot up and prices have climbed. When faced with toothache, a sick child, or a heart attack, all the unfortunate persons concerned can do is (17) up. Two thirds of the population (18) covered by medical insurance. Doctors charge as much as they want (19) that the insurance company will pay the bill.

The rising cost of medicine in the U. S. A. is among the most worrying problems facing the country. In 1981 the country’s health bill climbed 15.9 percent--about twice as fast as prices (20) general.

12()

A.which

B.what

C.that

D.it