已知f(x)是偶函数,当x0时,f(x)=_______________.

题型:填空题

问题:

已知f(x)是偶函数,当x<0时,f(x)=2x+1,当x>0时,f(x)=_______________.

考点:指数函数的解析式及定义(定义域、值域)指数与指数幂的运算(整数、有理、无理)
题型:填空题
曲线
x2
36
+
y2
9
=1
与曲线
x2
36-k
+
y2
9-k
=1(k<9)
的(  )
A.长、短轴相等B.准线相等
C.离心率相等D.焦距相等
题型:填空题

系统运行的异常情况应该记录下来,以便系统的维护和改进。记录方式有人工和自动两种。这两种方式各有优缺点,以下评述不恰当的是()。

A.自动记录省力、高效但不利于对异常引起重视

B.手动记录繁琐但利于了解异常问题的细节

C.自动记录目前还难以做到

D.手工记录操作起来容易流于形式

题型:填空题

属于子宫内膜癌ⅡB期的是()

A.侵犯肌层>1/2

B.累及宫颈黏膜腺体

C.侵犯宫颈间质

D.侵犯子宫浆膜层

E.盆腔淋巴结或 * * 转移

题型:填空题

旧纯毛非结织的栽绒地毯

题型:填空题

Facts about Aging


The overall difference in life expectancy at birth in the United States is about 7 years (i.e.72 for men vs. 79 for women); and at every age women, on average, can expect to live longer than men. Interestingly, older women are more likely to suffer from debilitating illnesses than men. However, this difference seems to reflect the fact that women typically have less wealth and education than men - two factors that are associated with shorter life expectancies for both sexes. When the effects of poverty and education are removed in the relevant statistical analyses, these sex differences in rates of disability disappear.
The elderly generally show very high interest in associating with friends and close family members. What they show less interest in than younger adults is the expansion of their social networks to make new friends.
About one-third of problem drinkers develop their alcohol abuse problem late in life, and this problem of alcoholism among the aged is indeed more acute for women than men. Overuse of drugs may result from the tendency of some doctors to automatically prescribe drugs rather than search for underlying physical or psychological causes of symptoms, especially when the patients are elderly women. It may also reflect the fact that women are more likely to be facing the loneliness and stress associated with the loss of a spouse than men, and are generally more likely to seek help from a doctor.
Alzheimer’s disease, the much-dreaded form of dementia associated with profound memory loss and other increasingly devastating symptoms, is a condition that strikes a significant number of elderly people. Nevertheless, most elderly people will never suffer such memory loss. In fact, contemporary estimates suggest that moderate to severe memory loss is found in only 4 to 6 percent of adults over age 65. The most important point to be aware of is that while memory (especially short term memory) does deteriorate somewhat as we get older, profound memory loss is not a "natural" consequence of the aging process. It is a product of disease. Evidence of profound memory loss should prompt a visit to a physician who specializes in such problems.
after age 80 the ratio of widows to widowers in the U.S. is about 5 to 1. This statistic reflects the fact that women have a longer life expectancy than men, and the fact that women typically marry men older than themselves. Differences in wealth may also make it easier for marriage-minded widowers to find mates than widows, since elderly women are more likely to be living in poverty than elderly men.
The stereotype of depressed lonely old people is a pervasive one, but it is not supported by the facts. While social isolation is a problem for many older people, it is also a problem for many young people as well. Surveys consistently show that, in the absence of serious illness, older people generally report higher levels of happiness or life satisfaction than young people. One reason for this is that as people age they seem to devote increasing attention to the task of managing their affective states and avoiding sadness or anxiety.
Although there is considerable variability in the degree of loss, sensory decline is fairly inevitable. These losses, it should be noted, have important implications for environmental design in the care of the elderly. For example, greater use of acoustical tile to absorb background noise, use of non-slippery floor surfaces to provide additional traction, and use of non-glare surfaces and clearly marked boundaries can all increase comfort and safety.

Compared with young people, older people are more likely to
A. fall ill.B. feel depressed.
C. experience satisfaction. D. isolate themselves from society.

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