若二次三项式x2-6x+k2是完全平方式，则k的值为（ ） A．9 B．3 C．

2009年销售商品房住宅平均每套面积为( )。

A．105.4平方米

B．107.2平方米

C．110.5平方米

D．125.6平方米

Logistics System A logistics system consists of different functions and activities,such as the following: 1.Customer service is a core function in the logistics process.Each business entity should have a customer service department to handle complaints,special orders,loss and damage claims,returns,bills problem,and etc．This function becomes crucial because any dissatisfaction can lead to failure to retain customers. 2.Inventory management is to maintain the stock of raw materials and half-finished products.In order to satisfy the customers＇demand and minimize costs,a company should establish an optimal level of inventory to meet the market demand that exceeds our expecta-tions,and at the same time,minimize your inventory holding costs and inventory write-down costs. 3.Transportation has taken a great role in many logistics systems for two reasons.First of all,globalization and importing-exporting activities make most products necessary to be transferred from one country to another.Secondly,information revolution has propelled the manufacturing process and consumer behaviors to be changed drastically.Traditional trans-portation methods need to be upgraded to accommodate modern transportation demand,therefore,containerization and usage of information sharing system emerge. 4.Storage is needed to manage the materials and store ready-for-market products in warehouses.There is new technology applied in the storage,for example,automatic ware-house.Old-fashioned warehouse has become the distribution center where container trucks deliver and pick up the goods. 5.Information system links all logistics processes and integrates all information to en-sure all the handling of large quantity of goods are delivered in an efficient,cost-effective and accurate manner. Questions:

Why is customer service an important element？（）

A.To retain and keep customers.

B.To gather information about competitors.

C.To develop new market.

D.To strengthen business partner relationships.

立法听证是我国人大探索立法的新形式，所谓“立法听证”，就是让与即将出台的法律有利益关系的公众，或者法律专家、学者参与了解该法律的立法背景及具体内容，并发现、质疑该法律中存在的问题，以保障该法律趋于完善的一种立法程序。这说明立法听证

A．是国家权力机关坚持民主集中制原则的具体体现

B．是行政机关坚持依法行政的具体体现

C．是司法机关公正司法的具体体现

D．是中 * * 党执政为民的具体体现

新生儿每日生成胆红素的量约

A．10.5mg/kg

B．8.5mg/kg

C．6. 5mg/kg

D．4. 5mg/kg

E．2. 5mg/kg

汽轮机油的粘度选择是由制造厂家根据（）而确定的。

A.汽轮机参数；

B.汽轮机转数；

C.机组额定负荷；

D.发电机功率。