在乙烯分子中有5个σ键、一个π键,它们分别是 [ ] A.sp2杂化轨道形成σ键

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问题:

在乙烯分子中有5个σ键、一个π键,它们分别是 [ ]

A.sp2杂化轨道形成σ键、未杂化的2p轨道形成π键

B.sp2杂化轨道形成π键、未杂化的2p轨道形成σ键

C.C-H间是sp2杂化轨道形成的σ键,C-C之间是未参加杂化的2p轨道形成的π键

D.C-C间是sp2杂化轨道形成的σ键,C-H之间是未参加杂化的2p轨道形成的π键

考点:杂化轨道理论(中心原子杂化方式)σ键、π键
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保密原则的具体要求在必要时可以除外()

A.保护患者隐私

B.保护家庭隐私

C.告知家属必要信息

D.不公开患者提出保密的不良诊断

E.不公开患者提出保密的预后判断

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下列对于广泛性焦虑描述不正确的是()。

A.表现为无明确对象和具体内容的焦虑和紧张不安

B.对现实生活的某些问题过分担心和烦恼

C.常伴有自主神经症状

D.常有主动性回避行为

E.有运动性不安

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消防性能化设计中,下列基本步骤正确的是()。

A.确定设计目标-建立性能判定标准-建立设定火灾场景-建立试设计

B.确定设计目标-建立试设计-建立性能判定标准-建立设定火灾场景

C.确定设计目标-建立性能判定标准-建立试设计-建立设定火灾场景

D.确定设计目标-建立试设计-建立设定火灾场景-建立性能判定标准

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The "standard of living" of any country means the average person’s share of the goods and services which the country produces. A country’s standard of living, (1) , depends first and (2) on its capacity to produce wealth." Wealth" in this sense is not money, for we do not live on money (3) on things that money can buy. "Goods" such as food and clothing, and "services" such as transport and " (4) ". A country’s capacity to produce wealth depends upon many factors, most of (5) have an effect on one another. Wealth depends (6) a great extent upon a country’s natural resources. Some regions of the world are well supplied with coal and minerals, and have a fertile soil and a (7) climate; other regions possess none of them.

Next to natural resources (8) the ability to turn them to use. China is perhaps as well (9) as the USA in natural resources, but suffered for many years from civil and (10) wars, and (11) this and other reasons was (12) to develop her resources. (13) and stable political conditions, and (14) from foreign invasion, enable a country to develop its natural resources peacefully and steadily, and to produce more wealth than another country equally well (15) by nature but less well ordered.

A country’s standard of living does not only depend upon the wealth that is produced and consumed (16) its own borders, but also upon what is indirectly produced through international trade. (17) , Britain’s wealth in foodstuffs and other agricultural products would be much less if she had to depend only on (18) grown at home. Trade makes it possible for her surplus manufactured goods to be traded abroad for the agricultural products that would (19) be lacking. A country’s wealth is, therefore, much influenced by its manufacturing capacity, (20) that other countries can be found ready to accept its manufactures.

8()

A.comes

B.come

C.coming

D.came

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建议将黑洞内部的奇点看成时间开始和终结的地方的人是:()

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