在数据库设计中，将E-R图转换成关系数据模型的过程属于A．需求分析阶段 B．概念设计

直线3x－4y-4=0被圆(x－3)²+y²=9截得的弦长为             

If an American is satisfied with you，he will put his thumb and forefinger into a circle．That means OK．But in Brazil，the very sign is considered to be rude．In Poland，a guest usually presents flowers to his hostess．The number must be an odd（奇数）one．Besides，the hostess isn’t expected to remove the cover of the bunch of flowers．And usually，the red rose is a sign of love．

Usually we nod to express our agreement and shake our heads to show disagreement．To our surprise these body movements mean the opposite in Bulgaria．

The differences in customs and cultures in the world are really noticeable．We should learn more about them to avoid embarrassment（窘迫）．Then，would you please remember：When in Rome，do as the Romans do．

小题1:In Poland，if a man gives some odd red roses to a woman as a present，it means that he ____．

A．will invite her to a dinner party

B．has not been in love with her

C．will invite her to a party

D．has fallen in love with her小题2:If an American puts his thumb and forefinger into a circle，it shows that he_____ you．

A．will be friends with

B．is not been in love with

C．is willing to help

D．is satisfied with小题3:In Poland，it is _____ for the hostess to remove the cover of the bunch of flowers somebody has presented to her．

A．impolite

B．polite

C．strange

D．popular小题4:In Bulgaria，if a man nods， it means that he_____ with you．

A．will have a talk

B．disagrees

C．will shake hands

D．agrees小题5:The sentence“When in Rome，do as the Romans do．”Means that______．

A．we should learn from the Romans

B．we should work as the Romans do

C．we should obey its customs when we are in a foreign country

D．we have been Romans

截面为矩形的不锈钢材，除轧制外未经进一步加工，钢材的宽度为50毫米，厚度为5毫米，冷成形笔直状报验

对“系统”理论的理解，错误的是

A．一个系统是由许多相互关联、相互作用的要素组成的整体
B．闭合系统不具有自我调控能力
C．系统按属性分为自然系统和人造系统
D．系统整体的功能等于各组成部分功能的总和
E．每一个系统都包含上一个系统的次系统

生产质量和服务水平的高低取决于人的职业技能，与职业道德素质无关。