【摘要】 通过野外实地考察 ,研究了位于山东沂源大张庄的河流袭夺现象。查明了河流袭夺的形态特征 ,找到了河流袭夺的沉积证据 .研究表明 :沂源河流袭夺是全新世河流袭夺 ,其形成原因不仅是河流侵蚀能力的差异 ,还与气候变化、区域岩性与构造特征、流域地貌演进阶段等因素密切相关 .文末探讨了沂源河流袭夺在水利工程、资源勘察及教学研究中的重要意义 .更多还原

【Abstract】 When the traditional modes of teaching and the modern medias such as record, video and network were banded together closely, the teaching system design would be optimized. In this paper, the author discussed his practice about using modern medias in the rhythm teaching of dance sports.更多还原