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购买中心

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生活资料消费者购买商品时，往往是由消费者个人或一两个家庭成员做出的购买决策，而企业用户是集体作出购买决策，这一集体就称为购买中心，它包括所有参与决策的人或部门。

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English was always my favorite subject. In my freshman year of high school, I could write a killer composition. In my second year, my 36 allowed me to give spelling tests to the class. I had wonderful 37 of my junior year. Mrs. Alexander 38 me to sit at her desk and take over the class when she had to leave the room. Only my senior English class was 39 , as we had a teacher right out of college who expected college-level work. Every student received a “C” or “D” grade the first quarter. 40 English was still my subject.
I graduated from high school, 41 early and had children. Confident about my English, I often helped my kids with their English homework. And I 42 long articles and beautiful poetry as a columnist for a newspaper. Fifteen years later, I went to college, and because I had been an "A" student, I remained an ‘‘A” student. I 43 up to my own expectations.
Yesterday, I 44 my high school report cards when I was reading old papers. That bundle of report cards 45 back the old days. I remembered sitting in my advisor's office，explaining that I had always excelled at English, and 46 that I did not deserve a “D” from that 47 teacher of my senior year. The advisor was sympathetic but unable to change a (an) 48
Reading 49 my old report cards revealed something else too. I wanted to tore them or hide them. I was not an ‘‘A” student in high school English！Somehow, I had 50 myself of this，when the grades clearly reflected an 51 student with an occasional “ A ” or ‘‘ B” but mostly “C” s.
Had I lived up to those grades and 52 myself according to those letters，I would have never confidently sought my writing 53 . Had I believed in my early grades instead of myself，I would have allowed my fear of 54 to defeat my enthusiasm and damage my creativity. 55 ，I viewed my younger self as an “A” English student, except for that undeserved “D”.

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单项选择题

某施工单位(乙方)与某建设单位(甲方)签订了建造无线电发射试验基地施工合同。合同工期为38天。由于该项目急于投入使用，在合同中规定，工期每提前(或拖后)1天奖(罚)5 000元。乙方按时提交了施工方案和施工网络进度计划(见下图)，并得到甲方代表的同意。

实际施工过程中发生了如下几项事件。

事件1：在房屋基槽开挖后，发现局部有软弱下卧层。按甲方代表指示，乙方配合地质复查，配合用工为10个工日。地质复查后，根据经甲方代表批准的地基处理方案，增加工程费用4万元，因地基复查和处理使房屋基础施工延长3天，人工窝工15个工日。

事件2：在发射塔基础施工时，因发射塔坐落位置的设计尺寸不当，甲方代表要求修改设计，拆除已施工的基础，重新定位施工。由此造成工程费用增加1.5万元，发射塔基础施工延长2天。

事件3：在房屋主体施工中，因施工机械故障，造成工人窝工8个工日，房屋主体施工延长2天。

事件4：在敷设电缆时，因乙方购买的电缆质量不合格，甲方代表令乙方重新购买合格电缆。由此造成敷设电缆施工延长4天，材料损失费1.2万元。

事件5：鉴于该工程工期较紧，乙方在房屋装修过程中采取了加快施工的技术措施，使房屋装修施工缩短3天，该项技术措施费为队0.9万元。

其余各项工作持续时间和费用均与原计划相符。

对于事件1，乙方（）。

A．只可提出工期索赔

B．可提出工期和费用索赔

C．只可提出费用索赔

D．不可提出工期和费用索赔

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