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\o\ac(○,二) ○本人声明所呈交的论文是我个人在导师指导下进行的研究工作和所做的贡献均已在论文中作了明确说明并表示了谢意。作者签名：____________ 日期：____________本人同意上海海事大学有关保留、使用学位论文的规定，即：学保存论文。保密的论文在解密后遵守本规定。作者签名：__________
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