下列描述波长与频率关系的结论,哪个是错误的()A.波长与频率成反比 B.频率越高,波

题型:单项选择题

问题:

下列描述波长与频率关系的结论,哪个是错误的()

A.波长与频率成反比

B.频率越高,波长越短

C.频率越低,波长越长

D.频率越高,纵向分辨力越好

E.波长与频率成正比

考点:医学影像技术(医学高级)超声超声题库
题型:单项选择题

钩端螺旋体毒力最强的血清群是()

A.波摩那群

B.黄疸出血群

C.流感伤寒群

D.犬群

E.爪哇群

题型:单项选择题

阅读理解。

     For all the dinner table, a glass of milk seems to be a constant, at least it was when I was growing up.

It was widely believed that milk was integral in building strong bones and teeth. There's no doubt that

dairy products (乳制品), and milk in particular, are high in protein and calcium, and most milk products

are supplemented with Vitamin D and A.

     While it's well known that our bones need calcium, some studies suggest that high calcium intake

doesn't necessarily lower a person's risk for fractures (骨折). A Harvard study found that people who

drank two or more glasses of milk had no greater protection from breaking a bone than those who drank

a glass or less a week.

     There's no doubt that we need calcium. Some anti-dairy supporters claim that dairy can lead to heart

disease. Much of this claim is based on high fat and high dairy products, like cheeses and creams, which

may indeed contribute to cardiovascular problems. Some studies have linked high milk intakes with a risk

of prostate cancer; this seems to be caused by high-fat dairy products, not dairy in general.

     Although milk was always regarded as one of the most important thing we need for our bones, yet

least promoted, factors involved in strengthening bones. Perhaps we should think of dairy as less like a

nutrient and more like a food. If you like it, eat it. If not, find some others. Because some claims may not

be completely true, when I eat a cream, I'm not thinking about calcium, protein, or any such thing I'm

thinking delicious.

1. Which of the following is TRUE on the milk?

A. The more milk you drink, the more risk for fractures you might be.

B. The more milk you drink, the less risk for fractures you might be.

C. The less milk you drink, the less risk for fractures you might be.

D. There is no link between them.

2. Some anti-dairy supporters claim that dairy can lead to except _________.

A. cardiovascular problems

B. heart disease

C. prostate cancer

D. stomach cancer

3. The underlined words "some others" in the last paragraph refer to _________.

A. dairy products      

B. milk

C. food

D. cream

4. What's the author's attitude towards milk?

A. He doesn't like milk any more.  

B. He used to drink milk as a child.

C. He regards milk as a nutrient.      

D. He always cares about calcium, protein when he eats something.

5. We can learn from the text that _________.

A. All the claims are not completely true.      

B. High milk intakes can lead to cancer.

C. It's necessary for you to reduce milk intakes.    

D. Give up milk for your health.

题型:单项选择题

罗切斯特为什么说自己要和英格兰小姐结婚,并且要简离开?

题型:单项选择题

关于工程量清单总报价的计算,下列表达不正确的等式是( )。

A.单位工程造价=分部分项工程费+措施项目费+其他项目费+规费+税金
B.分部分项工程费=∑分部分项工程量×分部分项工程综合单价
C.措施项目费=措施项目工程量×措施项目综合单价
D.单项工程造价=∑单项工程报价

题型:单项选择题

新生儿期应用某些药物可能产生特殊的不良反应,包括()

A.胃肠道反应

B.皮疹

C.精神症状

D.呕吐

E.高胆红素血症

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