一般情况下,当生焦量在()左右时,催化裂化本身可以维持热平衡。 A.10% B.5%

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问题:

一般情况下,当生焦量在()左右时,催化裂化本身可以维持热平衡。

A.10%

B.5%

C.15%

D.20%

考点:催化裂化装置操作工催化裂化装置技术催化裂化装置技术题库
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患儿,6岁,活动后心悸、气促。X线平片显示心影呈"方盒"形。最可能的诊断是()

A.三尖瓣下移畸形

B.肺静脉畸形连接

C.大动脉错位

D.先天性主动脉窦瘤

E.先天性右位主动脉弓

题型:单项选择题

免疫球蛋白经酶水解后,可与两个相应抗原结合的片段是

A.Fab

B.F(ab')2

C.Fc

D.PFc'

E.Fd

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DOS是微机中常用的一种 ( )

A.操作系统

B.字处理软件

C.应用软件

D.编程语言

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Part 4


Questions 26-45


·Read the following passage and decide which answer bestfits each space.
·For questions 26-45, mark one letter A, B, C or D on the Answer Sheet.
The "standard of living" of any country means the (26) person’s share of the goods and services which the country produces. A country’s standard of living, therefore depends (27) and foremost on its capacity to produce wealth. "Wealth" in this (28) is not money, for we do not live on money (29) on things that money can buy: "goods" such as food and clothing, and "services" such as (30) and "entertainment".
A country’s capacity to produce wealth depends upon many factors, most of which have an effect (31) one another. Wealth depends (32) a great extent upon a country’s natural resources. Some regions of the world are well supplied with coal and minerals, and have a (33) soil and a favorable climate; other regions (34) none of them.
Next to natural resources (35) the ability to turn them to use. China is perhaps as well off as the USA in natural resources, but suffered for many years from (36) and external wars, and for this and other reasons was incapable (37) her resources. Sound and (38) political conditions, and freedom from foreign invasion, enable a country to develop its natural resources peacefully and steadily, and to produce more wealth than another country (39) well served by nature but less well ordered.
A country’s standard of living does not only depend upon the wealth that is produced and (40) within its own borders, but also upon what is indirectly produced through international trade. For example, Britain’s wealth in foodstuffs and other agricultural products would be much (41) if she had to depend only on those grown at home. Trade makes it possible for her surplus manufactured goods to be traded abroad for the agricultural products that would (42) be lacking. A country’s wealth is, therefore, much (43) by its manufacturing capacity, (44) that other countries can be found ready to (45) its manufactures.

A.consumed

B.assumed

C.presumed

D.resumed

题型:单项选择题

东晋的统治呈现出()的特点。

A、中央垂直领导

B、三省六部制

C、三公九卿制

D、门阀世族政治

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