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问题 单项选择题 A型题

关于胎儿头臀长（CRL）的叙述，不正确的是（）。

A.测量CRL，适用于7～12孕周

B.孕8周以前，所测头臀长实际是颈臀长

C.测量CRL的标准切面为胎体最长、最直的正中冠状切面

D.测量CRL时，不能包括胎儿肢体或卵黄囊

E.胚胎的颅顶部至臀部外缘的距离即为CRL

答案

参考答案：C

解析：孕8周以前，由于头部明显屈曲，故所测得的CRL实际是颈臀长，胚胎发育到胚胎期末，头逐渐伸展，尾逐渐退化，此时测量才是真正的CRL。测量CRL的标准切面为胎体或躯干最长、最直的正中矢状切面。

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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单项选择题

道的性格可以看作哪两种？（）

A、无有

B、先后

C、盛衰

D、阴阳
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