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中国人民解放军某空军部队，拟建设一雷达生产厂，经国家有关部门批准后，开始对本项目筹集资金和施工图设计，该项目资金由自筹资金和银行贷款两部分组成，自筹资金已全部到位，银行贷款预计在2007年7月30日到位。2007年3月18日设计单位完成了初步设计图纸，2007年3月 20日进入施工图纸设计阶段，预计5月8日完成施工图设计。该空军部队考虑到该项目要在年底前竣工，遂决定于3月19日进行施工招标。施工招标采用邀请招标方式，并于3月20日向与其合作过的施工单位中选择了两家发出了投标邀请书。[问题]1．建设工程施工招标的必备条件有哪些？2．本项目在上述条件下是否可以进行工程施工招标？为什么？3．在何种情况下，经批准可以采取邀请招标方式进行招标？4．招标人在招标过程中的不妥之处有哪些？回答并说明理由。

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