人体维生素D主要来源于() A.肝脏合成 B.肾脏合成 C.食物中摄取

题型:单项选择题 A1型题

问题:

人体维生素D主要来源于()

A.肝脏合成

B.肾脏合成

C.食物中摄取

D.甲状旁腺分泌

E.紫外线照射皮肤产生

考点:护士护理考试初级护师儿科护理学历年真题精选(一)
题型:单项选择题 A1型题

关于下列细胞器的叙述正确的一组是

①线粒体 ②叶绿体 ③高尔基体 ④核糖体 ⑤内质网 ⑥中心体

(1)上述所有细胞器都含有蛋白质

(2)与胰岛素合成与分泌有关的细胞器有②④⑤

(3)含单层膜的细胞器只有③⑤

(4)含RNA的细胞器只有①②[ ]

A.(1)(3)

B.(1)(4)

C.(2)(3)

D.(2)(4)

题型:单项选择题 A1型题

用于长期保存细菌等菌种()

A.半固体培养基

B.液体培养基

C.固体培养基

D.营养培养基

E.令冻真空干燥

题型:单项选择题 A1型题

只用试管和胶头滴管无法区分的一组溶液是

A.KOH和AlCl3

B.AlCl3和氨水

C.NaAlO2和盐酸

D.Na2CO3和盐酸

题型:单项选择题 A1型题

The first 50 years of the next millennium will be critical for the world’s population. By 2050 population growth should have leveled off, but by then we’ll have 10 billion people -- two-thirds as many again as we have today. The rate of population growth is something we can choose right now, though it’s not something that just happens, but a matter of human choice. The choice is a complicated one, with many variables, but it remains a choice.
If we want to prevent a population explosion, we should take action now -- or assist the poorer countries to do so. They need better government, better institutions, better labor and capital markets, better schools.
Anything that increases the value of women’s time and adds to the cost of caring for a child makes a woman less likely to have that child. Since big families are often seen as safety nets for illness and old age, improving poor people’s access to insurance, pensions and welfare institutions also has a major impact. This can be as simple as rural credit, providing a means of saving. Finally, there is education -- both for women and, perhaps even more important, for the next generation of children.
These steps are there to be taken, but there appear to be some countries that are not seriously trying at the moment. If we cannot achieve that we will certainly not control population.
That said, I don’t feel pessimistic that we are going to run out of resources: we are becoming more efficient at producing food faster than the rate at which population is increasing. There is, however, a risk that we will wreck the environment so effectively that the world will no longer be an attractive place to live. That really would be a dismal outcome, to reach world population equilibrium only to find we’d destroyed the natural environment in the process.

The author insists that the control of population should not be at the cost of ______.

A.sacrificing the poor people’s welfare

B.losing something equally precious

C.improving the environment

D.reaching the equilibrium of population

题型:单项选择题 A1型题

当加热炉炉管泄漏着火时,燃料油雾化蒸气可以用作灭火蒸汽。()

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