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Sad performance
履约保函是指:招标人和中标的投标人在签订合同后,即成为接受承包人和承包人。承包人必须向接受承包人提供银行开立的履约保函,金额一般为合同金额的10%-15%,以确保承包人按合同条款履约。否则,由银行负责赔偿一定金额,最高不超过履约保函的总金额。