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联合国是世界上由主权国家组成的国际组织，也是唯一能发行国际邮票的国际组织。从上个世纪80年代以来，由于中国的发展受到世界更多的......
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Brief Analysis on Complaints about the Quality of Agricultural Machinery and New Product Development
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为研究闭锁力对火箭弹发射的影响，采用发射动力学仿真的方法，在Adams中建立火箭炮的动力学模型，分别仿真不同闭锁力下火箭弹的发射过......
