点(2,-2)是函数f(x,y)=x(4―x)―y(y+4)的()。 A.极小值点

题型:单项选择题

问题:

点(2,-2)是函数f(x,y)=x(4―x)―y(y+4)的()。

A.极小值点

B.非极值点

C.非极值驻点

D.极大值点

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题型:单项选择题

患者,女性,48岁,腹泻3个月余,为果酱样大便,查体:腹软,无包块,无压痛。

以下检验检查对于确诊帮助最大的是()

A.血常规

B.PPD试验

C.钡灌肠

D.粪便常规或孵化检查

E.纤维结肠镜

题型:单项选择题

成山头位于山东半岛的最东端,在海图上称为( )。

A.天尽头

B.成山角

C.山东高角

D.山东东角

题型:单项选择题

第二代计算机中,除了采用了晶体管作为逻辑元件之外,还( )。

A.采用水银延迟线作存储器

B.使用机器语言

C.使用磁盘、磁带作为外存储器

D.出现汇编语言

题型:单项选择题

对组织成员施加影响,使组织成员为实现组织目标而努力的活动称为管理的______职能。

A.计划
B.组织
C.控制
D.领导

题型:单项选择题

Modern industrial society grants little status to old people. In fact, such a society has a system of built-in obsolescence. There is no formal system for continuing our education throughout our life in order to keep up with rapidly changing knowledge. When our education and job skills have grown obsolete, we are treated exactly like those who have never gained an education or job skills and are not encouraged or given the opportunity to begin anew.As a society becomes more highly developed, the overall status of older people diminishes. Improved health technology creates a large pool of old people, who compete for jobs with the young. However, economic technology lowers the demand for workers and creates new jobs for which the skills of the aged are obsolete, forcing older people into retirement. At the same time, young people are being educated in the new technology and are keeping pace with rapid changes in knowledge. Finally, urbanization creates age-segregated neighborhoods. Because the old live on fixed incomes, they must often live in inferior housing. All these factors — retirement, obsolete knowledge and skills, inferior standards of living — lower the status of the aged in society.A century ago, when one could expect to live only to 50 or so, the life span more or less coincided with the occupation and family cycle. But today the average life span allows for fifteen to twenty years of life after these cycles. It appears that our life span is outpacing our usefulness in society.

The author’s attitude toward the aged is________.

A.realistic

B.optimistic

C.pessimistic

D.sympathetic

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