欠电流继电器的()触头接于控制电路中。A、常开 B、常闭 C、主 D、辅助

题型:单项选择题

问题:

欠电流继电器的()触头接于控制电路中。

A、常开

B、常闭

C、主

D、辅助

考点:动力与电气工程电机与电气控制技术电机与电气控制技术题库
题型:单项选择题

根据上下文的提示,补写出古诗文名篇名句找那个的空缺部分。

(1)域民不以封疆之界,固国不以山溪之险,威天下不以兵革之利。__________________,__________________。(《孟子二章》)

(2)树木丛生,百草丰茂。__________________,__________________。(曹操《观沧海》)

(3)惶恐滩头说惶恐,零丁洋里叹零丁。__________________,__________________。

题型:单项选择题

阅读理解。

                                            The Diet Zone: A Dangerous Place

   Diet Coke, diet Pepsi, diet pills, no-fat diet, vegetable diet… We are surrounded by the word "diet"

everywhere we look and listen. We have so easily been attracted by the promise and potential of diet

products that we have stopped thinking about what diet products are doing to us. We are paying for

products that harm us psychologically and physically.

   Diet products significantly weaken us psychologically. On one level, we are not allowing our brain to

admit that our weight problems lie not in actually losing the weight, but in controlling the consumption

(消耗) of fatty, high-calorie, unhealthy foods. Diet products allow us to jump over the thinking stage

and go straight for the scale(秤)instead. All we have to do is to swallow or recognize the word "diet" in

food labels (标签).

   On another level, diet products have greater psychological effects. Every time we have a zero-calorie

drink, we are telling ourselves without our awareness that we don't have to work to get results. Diet

products make people believe that gain comes without pain, and that life can be without resistance (抵

抗) and struggle.

   The danger of diet products lies not only in the psychological effects they have on us, but also in the

physical harm that they cause. Diet foods can indirectly harm our bodies because consuming them

instead of healthy foods means we are preventing our bodies from having basic nutrients (营养成分).

Diet foods and diet pills contain zero calorie only because the diet industry has created chemicals to

produce these wonder products. Diet products may not be nutritional, and the chemical that go into

diet products are potentially dangerous.

   Now that we are aware of the effects that diet products have on us, it is time to seriously think about

buying them. Losing weight lies in the power of minds, not in the power of chemicals. Once we realize

this, we will be much better able to resist diet products, and therefore prevent the psychological harm

that comes from using them.

1. From Paragraph 1, we learn that _____.

A. diet products fail to bring out people's potential

B. people have difficulty in choosing diet products

C. diet products are misleading people

D. people are fed up with diet products

2. One psychological effect of diet products is that people tend to _____.

A. try out a variety of diet foods

B. hesitate before they enjoy diet foods

C. pay attention to their own eating habits

D. watch their weight rather than their diet

3. In Paragraph 3, "gain comes without pain" probably means _____.

A. losing weight is effortless

B. it costs a lot to lose weight

C. diet products bring no pain

D. diet products are free from calories

4. Diet products indirectly harm people physically because such products _____.

A. are over-consumedB. lack basic nutrients

C. are short of chemicalsD. provide too much energy

题型:单项选择题

下列选项中不属于结构化程序设计方法的是______。

A.自顶向下

B.逐步求精

C.模块化

D.可复用

题型:单项选择题

开瓣音的论述,错误的是

A.见于二尖瓣狭窄而瓣膜尚柔软时
B.响亮、清脆
C.在心尖内侧较清楚
D.位于第一心音后0.07s
E.音调高、历时短促

题型:单项选择题

由少量地塞米松与甘油等制成的15克包装的皮肤用药

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