（一）跨地级行政区（直辖市下辖县区）提供建筑服务；
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，详情可参考51吃瓜
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Nothing in the argument required the arc to be a semicircle. If the arc has length xxx times the circumference (where x≤1/2x \leq 1/2x≤1/2), each anchor's event has probability xN−1x^{N-1}xN−1 instead of (1/2)N−1(1/2)^{N-1}(1/2)N−1. Mutual exclusivity still holds because the gap is at least 1−x≥1/21 - x \geq 1/21−x≥1/2 of the circumference, too large for any other anchor's arc to bridge:
2. 老年教育与文化娱乐： 老年大学、社区艺术培训及适配老年人的数字娱乐内容开发。通过简洁易用的社交平台或虚拟旅游体验，帮助老年人跨越数字鸿沟，消除孤独感 [4, 39]。