搜题请搜索小程序“爱下问搜题”
问题 选择题

右图是采用膜分离技术的海水淡化装置，对海水加压后，只有水分子可以通过淡化膜，离子等其他粒子不能通过淡化膜．加压后，装置右侧海水中增加的是（　　）

A．溶质质量分数

B．溶剂质量

C．溶液质量

D．溶质质量

答案

A、溶质的质量不变，溶液的质量减小，故质量分数是增大的．故该选项正确；

B、水通过淡化膜向左侧移动了，所以溶剂的质量减小了．故该选项错误；

C、溶剂质量减小，溶液的质量就减小了．故该选项错误．

D、溶质不能通过淡化膜，所以其质量是不变的．故该选项错误．

故选A．

单项选择题

儿童早期教育包括()

A．认识能力培养

B．情绪调控能力培养

C．社会适应能力培养

D．以上都是

E．以上都不是
查看答案
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 statements about primary cooperation is supported by information in the passage

A．It was limited in prehistoric times.

B．It is usually the first stage of cooperation achieved by a group of individuals attempting to cooperate.

C．It is an ideal that can never be achieved.

D．It is most commonly seen among people who have not yet developed reading and writing skills.
查看答案