Optimization of model of covering soil layer inside levee for dongting lake region by seepage fem 洞庭湖区堤内压盖模型渗流有限元优化
2.
The 20 burials of late neolithic to early bronze age c . 2000 to 1000 b . c . were found in a sandbar and appeared to have been properly laid out 二十座新石器时代晚期至青铜器时代早期(约公元前二千至公元前一千年之间)墓葬，主要分布在沙堤内侧，似有一定布局。
