合同一旦签署了就具有法律约束力，除非 （ ） 。
- A.一方不愿意履行义务
- B.损害社会公共利益
- C.一方宣布合同无效
- D.一方由于某种原因破产
正确答案及解析
正确答案
解析
本题考查无效合同的条件。
《系统集成项目管理工程师教程》的“有效合同原则”节中指出：与有效合同对应，需要避免无效合同。无效合同通常需具备下列任一情形：（1）一方以欺诈、胁迫的手段订立合同。（2）恶意串通，损害国家、集体或者第三人利益。（3）以合法形式掩盖非法目的。（4）损害社会公共利益。（5）违反法律、行政法规的强制性规定。
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