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问题 问答题

潜水艇和潜水员潜入水中的深度为什么都有一定的限度？

答案

潜水艇和潜水员能够承受的压强是有一定限度的．因为液体压强随着液体深度的增加而增大，当潜水艇和潜水员潜入水中的深度过深，受到水的压强过大，会因承受不了而造成伤害．

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.

The underlined word "fragile" in the last paragraph is closest in meaning to ______.

A. inefficient
B. easily broken
C. poorly planned
D. involuntary
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单项选择题

（）是网络终端进行通信时第一个端到端的层

A.传输层

B.应用层

C.感知识别层
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