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天问1号为何选这里着陆火星？美国明确限定范围，中国也要遵从？
大家知道天问一号已经切入到火星轨道了，它入轨以后的第一项重要工作就是为火星车确定着陆点，大概需要3个月的时间，为什么选一个着陆点用那么长时间？
焦维新教授70/654
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