商品标价签(牌)的填写要求有哪些?

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问题:

商品标价签(牌)的填写要求有哪些?

考点:315权益知识竞赛315权益知识竞赛题库
题型:问答题 简答题

某实验小组的同学探究燃烧的条件.

【提出问题】

①白磷和红磷是否都能燃烧?

②燃烧是否都需要空气(氧气)?

③白磷和红磷燃烧所需要的温度是否一样?

【进行实验】

实验装置现象
a①薄铜片上的白磷燃烧.

②红磷和热水中的白磷不燃烧.

b水下的白磷燃烧
【分析现象】

(1)实验a薄铜片上白磷燃烧而红磷不燃烧,说明燃烧需要条件的是______;白磷的着火点80℃.

(2)实验a薄铜片上白磷燃烧而热水中的白磷不燃烧,说明燃烧还需要条件的是______.

(3)解释实验b中水下白磷燃烧的原因______.

【问题讨论】

实验小组的一位同学认为上述实验方案有缺陷,不能证明红磷是可燃物.他认为应该补充以下实验:“取少许干燥红磷于试管中,塞上橡胶塞,置于酒精灯上加热”.

①预计观察到的实验现象是______;

②塞橡胶塞的目的是______.

【结论与评价】

写出白磷(分子式:P4)燃烧生成五氧化二磷的化学方程式______.

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遗失

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I suppose that having been brought up in the countryside and close  to animals,it wasn’t remarkable(不平常的)when I decided  to become a vet(兽医).Luckily I was also good at all the necessary science subjects. So after the college entrance examination I found myself at a veterinary college,training to look after animals in all kinds of situations. I hoped that I would be able to work in the research field so that I could find cures for animal diseases.

Much to my surprise,I found public health care was a very important aspect of my course. This is an area of animal medicine where a vet’s work has many things in common with the work of a doctor of human diseases. I particularly liked it because I recognized that the study of animal diseases can help human medicine. As we know,many infectious diseases come from animals—including SARS and bird flu.

Some of the infections have only been understood after carefully analytical work in labs by animal doctors. They helped identify the animal source for diseases such as SARS. They were also the first to identify various kinds of viruses. Sometimes vets are also able to suggest a cure for human illnesses. When I found this out I was determined to make public health medicine my chosen career.

After graduation,I applied for a job in public health. Soon I found myself concerned with the problem of bird flu. This is  an illness that attacks birds,but humans can catch the disease  if they are in close contact with infected birds. Though the job  is dangerous,it makes me proud that vets and other animal  disease researchers are in the front line helping to fight these  unknown human diseases

小题1:The writer wanted to become a vet mainly because______.

A.he did well in all necessary subjects

B.he wanted to help animals

C.he was close to animals in his early life

D.he wanted to find cures for human diseases小题2:What made the writer particularly like the course of public health care was that________.

A.it was both important and interesting

B.it could help him connect many human diseases with animals

C.it made a vet’s work very much like a doctor’s

D.it could help human medicine by studying animal diseases小题3:What can be followed if this passage continues?

A.The writer’s happy family life.

B.How the writer did research work in studying bird flu.

C.How the writer dealt with the relationship with other workmates.

D.What difficulty the writer met in the research work.小题4:Which of the following is implied in the passage?

A.Animals with infectious diseases should be killed.

B.Keeping animals is dangerous to humans.

C.Dangerous as a vet’s job is,it is significant to the human race.

D.Animal researchers work in the same way as human doctors.小题5:Which of the following statements is NOT true?

A.Being a vet is helpful to both animals and humans.

B.Vets can cure both animals and humans.

C.Vets helped identify animal resources for SARS.

D.Both SARS and bird flu are infectious diseases coming from animals.

题型:问答题 简答题

临床上使用的基托材料主要为热凝和自凝基托材料两种,在组成、性能及应用上都不同。热凝塑料在临床使用中,充填时期是()。

A.湿砂期

B.糊状期

C.粘丝期

D.面团期

E.橡胶期

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盈余公积转增资本时,转增后留存的盈余公积的数额不得少于注册资本的( )。

A.15%
B.25%
C.35%
D.50%

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