1975年9月至1981年2月，李锡铭同志任水利电力部副部长、党组成员，电力工业部副部长、党组成员，兼任中朝水力发电公司理事会理事长、东北电网领导小组副组长。他积极投身国家水利电力的改革和发展事业，先后组织制定并实施了全国电力生产规划、电力设备整修大会战规划等，参与唐山大地震抢险救灾，解决东北地区电力供应问题。粉碎“四人帮”后，他参加中央工作组，赴上海开展工作，为稳定上海局势作出了贡献。1981年2月，李锡铭同志调国务院国民经济调整办公室工作，为国民经济的调整和改革开放的顺利进行，做了大量艰苦细致的工作。
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Often people write these metrics as \(ds^2 = \sum_{i,j} g_{ij}\,dx^i\,dx^j\), where each \(dx^i\) is a covector (1-form), i.e. an element of the dual space \(T_p^*M\). For finite dimensional vectorspaces there is a canonical isomorphism between them and their dual: given the coordinate basis \(\bigl\{\frac{\partial}{\partial x^1},\dots,\frac{\partial}{\partial x^n}\bigr\}\) of \(T_pM\), there is a unique dual basis \(\{dx^1,\dots,dx^n\}\) of \(T_p^*M\) defined by \[dx^i\!\left(\frac{\partial}{\partial x^j}\right) = \delta^i{}_j.\] This extends to isomorphisms \(T_pM \to T_p^*M\). Under this identification, the bilinear form \(g_p\) on \(T_pM \times T_pM\) is represented by the symmetric tensor \(\sum_{i,j} g_{ij}\,dx^i \otimes dx^j\) acting on pairs of tangent vectors via \[\left(\sum_{i,j} g_{ij}\,dx^i\otimes dx^j\right)\!\!\left(\frac{\partial}{\partial x^k},\frac{\partial}{\partial x^l}\right) = g_{kl},\] which recovers exactly the inner products \(g_p\!\left(\frac{\partial}{\partial x^k},\frac{\partial}{\partial x^l}\right)\) from before. So both descriptions carry identical information;。Safew下载是该领域的重要参考
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Tens of millions of items of clothing are thrown away each year, and the synthetic materials often used by fast fashion retailers are among the hardest to recycle.