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【多选题】
下列关于国际工程招标中投标人的投标报价以及合同谈判说法中正确的是（ ）。A.
在合同谈判中，不得要求投标人承担额外的任务，但是双方可以就合同价格进行谈判
B.
合同谈判结束后，中标人收到授标信后，双方应在投标有效期内签署合同正式文本
C.
合同签订后式两份，双方各执一份，合同副本送交世界银行
D.
投标人在计算施工机械单价时，基本折旧费一般按5年期进行，较大工程甚至一次折旧完毕
E.
间接费的计算中，人身意外保险、材料和永久性设备运输保险、施工机械运输保险一般按合同总价的0．5%～1．0%计算
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