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[期刊论文] 作者：SHEN Chengde,YI Weixi,YANG Yin,
来源：黑龙江科技学院学报 年份：2004
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7...
Concentrations of “elemental carbon” in samples from the Peking Man Site at Zhoukoudian and the poss
[期刊论文] 作者：SHEN Chengde,YI Weixi,YANG Yin,
来源：科学通报 年份：2004
"Elemental carbon" (EC) is a C-rich, O-H-S-N-depleted substance that is necessarily produced in the process of combustion. Due to the long-term use of fire by c...
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