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某项目，需要采购价值280万元的设备，该采购项目属于政府采购项目，招标代理机构向业主提出可以采用公开招标或竞争性谈判进行采购。业主选择了采用竞争性谈判方式进行采购。问题在什么情况下业主可以选择竞争性谈判方式

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某省重点工程项目计划于2009年12月28日开工，由于工程复杂，技术难度高，一般施工队伍难以胜任，业主自行决定采取邀请招标方式。在2008年9月8日业主向通过资格预审的A、B、C、D、E五家施工承包企业发出了投标邀请书。该五家企业均接受了邀请，并于规定时间9月20日～9月22日购买了招标文件。招标文件中规定，10月18日下午4时是招标文件规定的投标截止时间，11月10日发出中标通知书。在投标截止时间前，A、B、D、E四家企业提交了投标文件，但C企业于10月18日下午5日才送达，原因是路途堵车。10月21日下午由当地招标投标监督管理办公室主持进行了公开开标。评标时发现E企业投标文件虽无法定代表人签字和委托人授权书，但投标文件均已有项目经理签字并加盖了单位公章。问题业主白行决定采取邀请招标方式的做法是否妥当说明理由。

已经十点半了，你现在必须去睡觉。

I remember my math teacher Mr. Young very well. He stood out because the kids made fun of him. He was missing one of his fingers, and always pointed at students with his middle finger.I was not very good at English and math. No matter how hard I tried, I just could not figure out why I did not understand what all the other kids found so easy to learn.One day, I was told that if I got one more E on my report card, I would be taken to the" big prison for kids".I tried really hard for weeks. I just couldn’t understand how to make different parts of members into whole things.The day before report cards were to come out, I knew that Mr. Young would give me an E ,just like he always did.I went to Mr. Young and told him that the orphanage was going to send me to the big prison if I got another E on my report card. He told me there was nothing he could do;it would be unfair to the other kids if he gave me a better grade than I had actually earned.I smiled at him and said, "Mr. Young, do you know how the kids make fun of you because you’re missing your finger" He looked at me, moved his mouth to one side and said nothing."They shouldn’t do that to you because you can’t help having a finger, Mr. Young. Just like I can’t help not being able to learn numbers and stuff like that. "I said.The next day, when I got my report card, I tucked it into one of my books. While on the school bus, I opened it : Geography, B+ ; Mechanical Drawing, C- ; English, D- ; History, C- ; Gym, B+ ; Art, C ; Math, D-.That math grade was the most favorite one I ever received. Because I knew that someone in the world finally understood what it was like for me to be missing a finger inside my head. The reason why the boy remembers Mr. Young is that（）

A. he missed one of his fingers
B. he treated his students very well
C. he understood the boy
D. he taught his students in a special way

某工程项目，业主采取公开招标方式进行招标。有A、B、C、D、E五单位符合投标资格条件。该招标项目的评标委员会成员由7人组成，其中当地招标投标监督管理办公室1人、公证处1人、招标人1人、技术经济方面专家4人。评标委员会于10月28日提出了书面评标报告。B、A企业分列综合得分第一名、第二名。由于B企业投标报价高于A企业，11月10日招标人向A企业发出了中标通知书，并于12月12日签订了书面合同。问题合同签订的日期是否违规说明理由。