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答：有效，除非约定合同生效需签字并盖章。
Answer: effective, unless the contract agreed to sign and seal.
youdao
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如贵方同意并填毕以上服务条款，请在此签字（盖章）予以确认，谢谢！
The general business conditions of Lead are accepted by this signature.
youdao
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如贵方同意并填毕以上服务条款，请在此签字（盖章）予以确认，谢谢！
The general business conditions of Lead are accepted by this signature.
youdao