在同一档距中、各相导线的弧垂应力求一致、其误差不应大于（）。 A.0.5 B.0.4

以原发病例接触者人数为分母的是（）

A.医院感染发生率

B.医院感染例次发生率

C.医院感染患病率

D.医院感染漏报率

E.医院感染续发率

下列哪一个选项不属于公安机关内部工作运转秩序( )

A．接受报警与求助

B．入警程序

C．警容风纪

D．日常行政管理

颈椎损伤患者可以进行的影像学检查有：

①颈椎X线；

②颈椎CT（枕骨～T）；

③颈椎过伸过屈位X线；

④颈椎MRI。

患者双上肢肌力下降，应该进行的检查是（）

A.①

B.②

C.③

D.④

E.②+③

It is difficult to imagine what life would be like without memory. The meanings of thousands of everyday perceptions, the bases (51) the decisions we make, an d the roots of our habits and skills are to be (52) in our past experiences, which are brought into the present (53) memory.

Memory can be defined as the capacity to keep (54) available for later use. It includes not only "remembering" things like arithmetic or historical facts, but also any change in the way an animal typically behaves. Memory is (55) when a rat gives up eating grain because he has sniffed something suspicious in the grain pile. Memory is also involved when a six-year-old child learns to swing a baseball bat.

Memory (56) not only in humans and animals but also in some physical objects and machines. Computers, for example, contain devices for storing data for later use. It is interesting to compare the memory-storage capacity of a computer (57) that of a human being. The instant-access memory of a large computer may hold up to 100000 "words" —ready for (58) use. An average American teenager probably recognizes the meanings of about 100000 words of English. However, this is but a fraction of the total (59) of information which the teenager has stored. Consider, for example, the number of facts and places that the teenager can recognize on sight. The use of words is the basis of the advanced problem-solving intelligence of human beings. A large part of a person’s memory is in terms of words and (60) of words.

56（）。

A. exists

B. appears

C. affects

D. seems