无效证明
- 网络Mathematical fallacy;Invalid proof
无效证明-
许多涂料店都说有环保涂料，但查看标识和有关证书或检测报告，多数店主无法出示或出示的仅是无效证明。
Many paint stores have a green paint , but check logo and the certificate or test report , the majority owner is unable to produce or produce only proved ineffective .
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无效的证明将不能作为卖方不履行合同所规定的义务的借口。
Non-availability of material will not be an excuse to the Seller for not performing her obligation under this contract .