As navigator, Lovell took with him a sextant to take star readings - in case the computers failed and they had to find their own way home.
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HH x C++ Fast RoutingTraditional Routing A*2-phaseCalculation time: 13 secCalculation time: 36 sec，详情可参考旺商聊官方下载
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Trump eyes Venezuela visit – but obstacles to his oil plan remain