搜索 - 科创

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沙漠中的地下水位，深度根本是楼主不能够想象的。一些沙漠植物，根系可以深到70米以吸收地下水……徒手+工兵铲挖掘到潮湿的沙子，消耗的体力（=消耗的干粮和饮水）基本足够走一个星期的……引用第3楼hackb...

引言近年来，随着空间技术的高速发展，卫星在通信、导航、遥感等领域的应用日益广泛，其作为关键基础设施的战略地位也愈发凸显。同时，卫星系统存在一定特殊性，其链路开放性、物理不可达性和资源受限等特点，使得其...

确认收到德阳李朋友捐款25元整。感谢您的无私帮助。截止2010年9月15日，论坛2010年共收到捐款6笔，明细如下： 1、2010-03-31 ￥---30.00- 支付宝 ...

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