如图所示为一质点做直线运动的v－t图象，下列说法正确的是(　 　) A．CE段

某县医院，一个并不算复杂的药品回扣案，涉案干部、医生和职工50多人，占医院总人数的四分之一。药剂科长在2003年到2006年初就收受某医药公司贿赂60余万元。医院会计仅在2005年到2006年3月间多次收受回扣共6.4万元。负责办理药品入库等手续的仓库保管员于2005年至2006年3月间收受回扣5.4万元。50多名医生交出了回扣共计50余万元。 问题：

出现医药公司向医院的药剂科长、会计、仓库保管员、医生等行贿现象的原因是什么？

关于肺脏的血液供应，下列哪种说法是正确的（）。

A.肺动脉和肺静脉是肺的营养血管

B.支气管动脉与支气管静脉是肺的功能血管

C.组成小循环的肺动脉和肺静脉具有气体交换的功能

D.属于大循环的支气管动脉和支气管静脉具有气体交换的功能

E.支气管静脉注入奇静脉或半奇静脉，回流至下腔静脉

In essence, all rent-control policies involve specifying a maximum rent that a landlord may charge for a dwelling. The rationale for controlling rents is to protect tenants in situations where limited supply will cause rents to rise sharply in the face of increased demand. However, although rent control may help some tenants in the short run, it affects the rental housing market adversely in the long run because landlords become reluctant to maintain the quality of their existing properties and even more reluctant to have additional rentalhousing units built.
Which one of the following, if true, best explains the landlords’ reluctance described above ？（）

A．Tenants prefer low-quality accommodations with rent control to high-quality accommodations without it.

B．Rent control makes it very difficult for landlords to achieve reasonable returns on any investments in maintenance or in new construction.

C．Rent control is a common practice even though it does nothing to alleviate shortages in rental housing.

D．Rent control is generally introduced for political reasons and it takes political action to have it lifted again.

E．Tenants prefer rent control to the alternative of receiving direct government subsidies toward rents they cannot afford.

对一位心跳停止的成人进行心脏按压的频率或速度为

A．60/min
B．80/min
C．100/min
D．120/min
E．140/min

（）是指在项目建设单位通过对投资机会进行研究，向国家有关部门提出申请建设该项目的建议文件。

A.初步设计

B.可行性研究

C.施工图设计

D.工程项目建议书