The weight of each term is given by the proportion of each sub-triangle area with respect to the total triangle area . Algebraically, this can be expressed like so:
It will be the first crewed mission to the Moon since Apollo 17 landed on its surface in December 1972.，更多细节参见safew官方下载
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1A full list of these materials can be found at (psfa0134, pg. 9).