肱二头肌腱远端断裂限制功能的因素不包括（） A.旋后减弱 B.重体力劳动 C.重复运

从秘书服务对象的社会属性分类我国秘书可分为_________和社会秘书(有的称为民间秘书或私人秘书)两大类。

静止土压力E₀属于（）平衡状态，而主动土压力E_a及被动土压力Ey属于（）平衡状态，它们三者大小顺序为（）。

The economic system of the United States is principally one of private ownership. In this system, consumers, producers and government make economic decisions on a daily basis, mainly through the price system. The dynamic interaction of these three groups makes the economic function. The market’s primary force, however, is the interaction of producers and consumers; hence the “market economy” designation.　　As a rule, consumers look for the best values for what they spend while producers seek the best price and profit for what they have to sell. Government, at the federal, state, and local level, seeks to promote public security, assure reasonable competition, and provide a range of services believed to be better performed by public rather than private enterprises.　　Generally, there are three kinds of enterprises: single-owner operated businesses, partnerships and corporations. The first two are important, but it is the latter structure that best permits the amassing of large sums of money by combining the investments of many people who, as stockholders, can buy and sell their shares of the business at any time on the open market. Corporations make large-scale enterprises possible.The economic system of the United States is principally one of private ownership. In this system, consumers, producers and government make economic decisions on a daily basis, mainly through the price system. The dynamic interaction of these three groups makes the economic function. The market’s primary force, however, is the interaction of producers and consumers; hence the “market economy” designation.

院内感染所致肺炎中，主要病原体是（）

A.病毒

B.真菌

C.耐药金葡菌

D.需氧革兰阴性杆菌

E.肺炎球菌

内环境稳定是指

A．细胞外液的物理、化学因素保持着动态平衡

B．细胞内液理化性质保持不变

C．细胞外液理化性质保持不变

D．细胞内液的化学成分相对恒定

E．细胞外液的化学成分相对恒定