Almost 30,000 pieces of debris are calculated to be free-floating in space, created when rockets break up in space or satellites disintegrate.
以过硬作风创造过硬业绩，既要靠干部实干担当，也要靠组织保驾护航。
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The heat shield will need to be tested to see if it can safely return the materials
UNSAT problem with 10 variables and 200 clauses