取导管尖端培养进行血管相关性感染病原学诊断，其长度为 （） A.2cm B.3cm

外源性致热原的特点，正确的是（）

A.分子量较小

B.其致热原性可被蛋白酶类所破坏

C.能激活血液中的中性粒细胞和单核细胞

D.直接作用于体温调节中枢

E.在体内最终由肝、肾灭活和排泄

新生儿服用可发生低凝血酶原血症及出血的药物是（）

A.地西泮

B.苯巴比妥

C.唑吡坦

D.卡马西平

E.苯妥英钠

肺血栓栓塞症螺旋CT和电子束CT的表现直接征象是（）

A.轨道征

B.完全充盈缺损，远端血管不显影

C.条带状高密度区

D.肺叶楔形密度增高影

E.中心肺动脉扩张

飞机空机重心的位置如何确定？（）

A.每一个称重点到基准线的距离乘以各称重点称重所得读数，然后将乘积相加，再除以各称重点所得读数之和。

B.每一个称重点到基准线的距离乘以各称重点称重所得读数，然后将乘积相加，减去各称重点的毛重，再除以各称重点所得读数之和。

C.每一个称重点到基准线的距离乘以各称重点的净重，然后将乘积相加，再除以各称重点的净重之和。

D.每一个称重点到基准线的距离乘以各称重点的净重，然后将乘积相加，减去各称重点的毛重，再除以各称重点的净重之和。

Attempts to understand the relationship between social behavior and health have their origin in history. Dubos (1969) suggested that primitive humans were closer to the animals (1) they, too, relied’upon their instincts to stay healthy. Yet some primitive humans (2) a cause and effect relationship between doing certain things and alleviating (3) of a disease or (4) the condition of a wound. (5) there was so much that primitive humans did not (6) the functioning of the body, magic became an integral component ofthe beliefs about the causes and cures of heath (7) Therefore it is not (8) that early humans thought that illness was caused (9) evil spirit. Primitive medicines made from vegetables or animals were invariably used in combination with some form of ritual to (10) harmful spirit from a diseased body.

One of the. earliest (11) in the Western world to formulate principles of health care based upon rational thought and (12) of supernatural phenomena is found in the work of the Greek physician Hippocrates. The writing (13) to him has provided a number of principles underiying modern medical practice. One of his most famous (14) , the Hippocratic Oath, is the foundation of contemporary medical ethics.

Hippocrates also argued that medical knowledge should be derived from a (15) of the natural science and the logic of cause and effect relationships. In this (16) thesis, On Air, Water, and Places, Hippocrates pointed out that human well-being is (17) by the totality of environmental (18) : living habits or lifestyle, climate, geography of the land, and the quality of air, and food. (19) enough, concerns about our health and the quality of air, water, and places are (20) very much written in twentieth century.

3（）

A.symbols

B.signs

C.symptoms

D.syndromes