... 上正合序列 coexact sequence 上中心列 upper central series 上自由的 cofree ...
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Group upper central series 幂零群
upper p-central series 上p
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The Lower Carboniferous Ceshui and Upper Permian Longtan coal series are most important in Southeast China, and can both generate and bear gas greatly in the Lianyuan coal basin, Central Hunan, China.
湘中涟源煤盆地早石炭世测水组、晚二叠世龙潭组煤系是中国东南诸省境内最重要的煤系，具有较大的生气、储气能力。
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