已知函数f(x)=x4+ax3+2x2+b,其中a,b∈R.若函数f(x)仅在x

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问题:

已知函数f(x)=x4+ax3+2x2+b,其中a,b∈R.若函数f(x)仅在x=0处有极值,则a的取值范围是______.

考点:函数的单调性与导数的关系
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属于护理成本管理的是()

A.制定护士工作标准

B.开展护理服务成本核算

C.进行护理成本-效益分析

D.进行实时动态成本监测与控制

E.床日成本核算

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肠结核好发部位是()。

A.十二指肠多见

B.全消化道均可发生,呈节段性跳跃性分布

C.回盲部多见

D.空肠多见

E.从直肠向近段结肠呈倒灌性分布

题型:填空题

Less education, income linked to obesity in women, not men


Women who are better educated and live in households that are middle-income or above are less likely to be obese than women who are less educated and live in the lowest income households, new government research shows.
Among men, there is not a statistically significant (26) in obesity based on income and very (27) difference based on education, the data show.
(28) , about one in three U.S. adults-almost 73 million people-are obese, which is (29) 30 or more pounds over a (30) weight. Extra weight raises the (31) of diabetes, heart disease, some types of cancer and other (32) .
"There is a relationship between obesity and income, but it’s not a (33) story," says Cynthia Ogden, an epidemiologist with the National Center for Health Statistics, part of the Centers for Disease Control and Prevention.
"When looking at these two (34) of socioeconomic status-income and education-their (35) is greater on women than men," she says.
Jennifer Lovejoy, president of the Obesity Society, says that (36) -income women may be more likely to become obese because of environmental (37) such as lack of access to safe places to do physical activity and easy access to fast food.
Among the findings:
·29% of women who live in households with an annual income of $77,000 or more for a family of four are obese in opposition (38) 42% of women who live in households with an annual income below $29,000 for a family of four.
·23% of women with a college degree are obese, significantly less than the 42% of women with (39) than a high school education.
·33% of men who live in households with an annual income of $77,000 or more for a family of four are obese, (40) 29% of men who live in households with an annual income below $29,000 for a family of four are obese. This difference is not considered statistically (41) .
The analysis is based on (42) from the National Health and Nutrition Examination Survey, which is considered the gold (43) for evaluating obesity because it is a(an) (44) survey of people whose weight and height are actually (45) rather than being self-reported.

A. coverage B. dependenceC. response D. impact

题型:填空题

企业人力资源规划中总体规划的目标主要有( )。

A.明确部门编制

B.维护企业规范

C.改善企业文化

D.明确员工数量、结构

E.提高企业绩效

题型:填空题

经济内部收益率是反映项目对国民经济()的相对指标。

A.最大贡献

B.净贡献

C.平均贡献

D.综合贡献

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