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根據我國合同法，合同效力狀態有幾種？分別有哪些具體情形？

2020-11-16我國合同法中合同按效力劃分.，可以分幾類合同效力，指依法成立受法律保護的合同，對合同當事人產生的必須履行其合同的義務，不得擅自變

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