A filled torus (a doughnut) is a 3-manifold homeomorphic to \(S^1 \times D^2\), where \(D^2\) is the 2-dimensional disk. There exists a deformation retract from the doughnut to a circle, so the fundamental group of the doughnut is \(\pi_1(S^1 \times D^2) \cong \mathbb{Z}\).
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，更多细节参见体育直播
学习，是代表们提升履职能力的源头活水。全国人大代表、东方电气集团东方汽轮机有限公司副主任工程师曹天兰深有体会：“通过学习，既开阔了视野、明晰了思路，又系统了解了人民代表大会制度和人大工作，对履职中遇到的难点问题也有了解决办法，让我对持续提升依法履职的政治站位和能力水平有了更充足的信心。”
The tagline for this is “Journalism is better when it’s backed by live markets.” I’ve been staring at that tagline for a long time. What do you think is made better by live markets in the context of journalism?
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«Радиостанция Судного дня» передала сообщения про неказистого жиротряса20:51
Cycling is deterministic during the first traversal of the current stack.。业内人士推荐safew官方版本下载作为进阶阅读