题目内容
阅读以下说明和关系表，回答问题1-6。[说明] 设有三个关系 学生S(学号，姓名，性别，年龄，籍贯) 课程C(课程号，课程名，任课老师，所用教材) 学生成绩SC(学号，课程号，得分) 其中规定各属性定义如下： 学号：SNUM 姓名：SNAME 性别：SEX 年龄：AGE 籍贯：NATIVE 课程号：CNUM 课程名：CNAME 任课老师：TEACHER 所用教材：BOOK 得分：GRADE 试用关系代数表达式表示下列查询语句。 [问题1] 检索张三老师所授课程的名称。
查看答案
搜索结果不匹配？点我反馈
更多问题
There is an old saying in English: "Laughter is the best medicine". Until recently, few people took the saying very seriously. Now, however, doctors have begun to investigate laughter and the effects it has on the human body. They have found evidence that laughter really can improve people’s health.Tests were carried out to study the effects of laughter on the body. People watched funny films, while doctors checked their heart rate, blood pressure, breathing and muscles. It was found that laughter has similar effects to physical exercise. It increases blood pressure, the heart rate and the rate of breathing; it also works several groups of muscles in the face, the stomach, and even the feet. If laughter exercises the body, it must be beneficial.Other tests have shown that laughter appears to be capable of reducing the effect of pain on the body.There is also some evidence to suggest that laughter helps the body’s immune system, that is, the system which fights infection.As a result of these discoveries, some doctors and psychiatrists (精神病学家)in the United States now hold laughter clinics, in which they try to improve their patients’ condition by encouraging them to laugh.1) Laughter really can (46) .2) In the first test, it was found that laughter has similar effects to (47) .3) Other tests have shown that laughter can reduce the effect of (48) on the body.4) There is evidence to show that laughter helps the body’s (49) .5) In the clinics, the psychiatrists try to improve their patients’ condition by encouraging them (50) . 48（）
(一) [背景资料] 某大型工程，由于技术难度大，对施工单位的施工设备和同类工程施工经验要求比较高，而且对工期的要求比较紧迫。业主在对有关单位和在建工程考察的基础上，邀请了3家国有一级施工企业投标，通过正规的开标评标后，择优选择了其中一家作为中标单位，并与其签订了工程施工承包合同，承包工作范围包括土建、机电安装和装修工程。该工程共15层，采用框架结构，开工日期为2002年4月1日，合同工期为18个月。在施工过程，发生如下几项事件： 事件1：2002年4月，在基础开挖过程中，个别部位实际土质与甲方提供的地质资料不符造成施工费用增加2.5万元，相应工序持续时间增加了4天。 事件2：2002年5月施工单位为保证施工质量，扩大基础地面，开挖量增加导致费用增加3万元，相应工序持续时间增加了3天。 事件3：2002年8月份，进入雨季施工，恰逢20天大雨，造成停工损失2.5万元，工期增加了4天。 事件4：2003年2月份，在主体砌筑工程中，因施工图设计有误，实际工程量增加导致费用增加3.8万元，相应工序持续时间增加了2天。 事件5：外墙装修抹灰阶段，一抹灰工在五层贴抹灰用的分格条时，脚手板滑脱发生坠落事故，坠落过程中将首层兜网系结点冲开，撞在一层脚手架小横杆上，抢救无效死亡。 事件6：室内装修进行墙面涂料粉刷前，在检查装饰面基层时，发现墙面抹灰有大面积空鼓现象。 上述事件中，除第三项外，其他工序均未发生在关键线路上，并对总工期无影响。 该工程采用邀请招标方式且仅邀请三家施工单位投标，是否违反有关规定为什么
Professor Johnson’’s retirement_______from next January.
Some people believe that you have to be a special kind of person to sell a product. But although it is clear that a successful salesman does need special talents and an open personality, many of the skills be uses are used by us all.We build and keep relationships with different kinds of people, we listen to and take note of what they tell us and don’t just enjoy the sound of our own voices, and we explain things to them or discuss ideas with them.In the same way, any company needs to establish a personal relationship with its major clients and potential customers. It is often said that "people do business with people": a firm doesn’t just deal impersonally (没有人情味地) with another firm. A person in the buying department regularly receives personal visits from people representing the firm’s suppliers (供应商)—or in the case of department stores or chain stores, a team of buyers may travel around visiting their suppliers.Keeping sales people "on the road" is much more expensive than employing them to work in the office, Much of the sales people’s time is spent unproductively traveling. Telephone selling may use this time more productively, but a face-to-face meeting and discussion is much more effective. Companies involved in the export trade often have a separate export sales force. Its travel and accommodation expenses may be very high. As a result, servicing overseas customers may often be done by phone, telex (电传)or letter, and personal visits may be less often. Many firms appoint an overseas agent or distributor (分销商) whose own sales force takes over responsibility for selling their products in another country The last paragraph says that an overseas agent of a company is responsible for（）.
微信支付 
支付宝支付