题目内容

某经项目审批部门核准的工程建设项目施工招标，招标人自行办理招标事宜。由于该工程技术复杂，招标人决定采用邀请招标，共邀请A、B、C三家满足项目施工资质要求的施工企业参加投标。投标邀请书中规定：6月1日至6月3日9:00-17:00在招标人总经济师室出售招标文件。招标文件中规定，6月30日为投标截止日；投标有效期到7月20日止；投标保证金为100万元人民币，投标保证金有效期到8月20日为止；评标采用综合评价法，技术标和商务标的权重各占50%。在评标过程中，鉴于各投标人的技术方案大同小异，招标人决定将评标方法改为经评审的最低投标价法。评标委员会按经评审的最低投标价法，确定的评标结果排名顺序为A公司、C公司、B公司。招标人7月15日确定A公司中标，7月16日向A公司发出中标通知书，并于7月18日与A公司签订了合同。在签订合同过程中，经审查，A公司所选择的设备安装分包人不符合要求，招标人遂指定具有设备安装一级资质的D公司作为A公司的分包人。招标人于7月28日将中标结果通知了B、C两家公司，并向该两家公司退还投标保证金100万元。招标人于8月1日向当地招标投标管理部门提交了该工程招标投标情况的书面报告。 [问题] (1)招标人自行组织招标需具备什么条件 (2)依法必须招标的施工项目，在哪些情况下可以采用邀请招标 (3)指出招标人上述招标工作的不妥之处，逐一说明理由。

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