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问题 选择题

对下列事实的解释正确的是

 事 实解 释
A氧气用于切割金属氧气有可燃性
B洗洁精可用于除油污洗洁精能溶解油污
C打开汽水瓶盖有大量气泡冒出温度升高，气体溶解度减小
D做铁丝燃烧实验时集气瓶底部预先要装少量的水防止瓶底炸裂
 

答案

答案：D

A、氧气用于切割金属是利用了助燃性而不是可燃性，故A错误，

B、洗洁精是乳化油污而不是溶解油污，故B错误，

C、打开瓶盖是压强减小，气体的溶解度减小，而温度没变，故C错误，

D、该反应是放热反应，玻璃是热的不良导体，故D正确，

故选D．

单项选择题 A1/A2型题

关于平板检测器的叙述，错误的是（）

A.有直接转换型和间接转换型

B.其极限分辨率比屏-片系统低

C.其MTF比屏-片系统低

D.其DQE比屏-片系统高

E.DQE比CR系统高
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单项选择题

Cooperation is the common endeavor of two or more people to perform a task or reach a jointly cherished goal. Like competition and conflict, there are different forms of cooperation, based on group organization and attitudes.
In the first form, known as primary cooperation, group and individual unite. The group contains nearly all of each individual’s life. The rewards of the group’s work are shared with each member. There is an interlocking identity of individual, group, and task performed. Means and goals become one, for cooperation itself is valued.
While primary cooperation is most often characteristic of preliterate societies, secondary cooperation is characteristic of many modern societies. In secondary cooperation, individuals devote only part of their lives to the group. Cooperation itself is not a value. Most members of the group feel loyalty, but the welfare of the group is not the first consideration. Members perform tasks so that they can separately enjoy the fruits of their cooperation in the form of salary, prestige, or power. Business offices and professional athletic teams are examples of secondary cooperation.
In the third type, called tertiary cooperation or accommodation, latent conflict underlies the shared work. The attitudes of the cooperating parties are purely opportunistic; the organization is loose and fragile. Accommodation involves common means to achieve antagonistic goals; it breaks down when the common means cease to aid each party in reaching its goals. This is not, strictly speaking, cooperation at all, and hence the somewhat contradictory term antagonistic cooperation is sometimes used for this relationship.

Which of the following is NOT given as a name for the third type of cooperation

A. Tertiary cooperation.
B. Accommodation.
C. Latent conflict.
D. Antagonistic cooperation.
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