主动脉血流能在心动周期中保持相对稳定，其主要原因是主动脉的A．可扩张性和弹性B．血流

企业购买_乍辆并将车辆所有权办到股东个人名下，由于车辆同时也为企业经营使用，允许在企业所得税前扣除折旧。()

心痛进一步发展，瘀血闭阻心脉，可心胸猝然大痛，而发为（）

A.真心痛

B.厥心痛

C.胃脘痛

D.心悸

E.悬饮

牙宣辨证可分为______、______、______三型。

Psychologists once believed that the motive that caused men to strive to attain high-level managerial positions was the "need for achievement". But now they believe it is the "need for power".
Power seekers strive hard to reach positions where they can exercise authority over large numbers of people. (46) Individual performers who lack this drive are not likely to advance far up the managerial ladder. They usually scorn company politics and devote their energies to other types of activities. The power game is part of management, and it is played best by those who enjoy it most.
(47) One of the least rational acts of business organizations is that of hiring managers who have a high need to exercise authority, and then teaching them that authoritative methods are wrong and that they should be consultative or participative. (48) It is a serious mistake to teach managers that they should adopt styles that are inconsistent with their unique personalities. Yet this is precisely what a large number of business organizations are doing; and it explains, in part, why their management development programs are not effective.
(49) What managerial aspirants should be taught is how to exercise their authority in a way that is appropriate to the situation and the people involved. They need to learn that the real source of their power is their own knowledge and skill, and the strength of their own personalities, not the authority conferred on them by their positions. When they lack the knowledge or skill required to perform the work, they need to know how to share their authority. (50) But when they know what has to be done and have the skill and personality to get it done, they must exercise their traditional authority in whatever way is necessary.

外科病人最常见的酸碱平衡失调是（）

A．代谢性酸中毒

B．代谢性碱中毒

C．呼吸性酸中毒

D．呼吸性碱中毒

E．复合型酸碱平衡失常