Number (6): Everything in this space must add up to 6. The answer is 3-3, placed vertically.
"The entire sequence of Artemis flights needs to represent a step-by-step build-up of capability, with each step bringing us closer to our ability to perform the landing missions. Each step needs to be big enough to make progress, but not so big that we take unnecessary risk given previous learnings."，详情可参考91视频
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第二十九条 国家支持核反应堆在动力、供热、海水淡化、制氢、同位素生产以及科研等方面的应用。