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David： Hey Claire， do you feel like your job prospects are trending in the right direction？ Claire： I guess so. Why do ......
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文章在分析TDRSS传统的跟踪测轨方法的基础上,提出了一种利用TDRSS单向多普勒信息实现用户航天器自主导航定位的新方案.介绍了该方......
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The green and highly active catalyst for manufacture of PTA,which is produced by the Jinan Zhaohui Science and Technolog......
According to Customs-info network, China totally exported about 26,200 tons of rare earth products during the first half......
