本文摘要介绍此次调查的部分结果。
The resultant market survey report is partly introduced in this paper.
本文摘要介绍了船采的基本特征，船采工艺在国内外的应用概况以及发展前景。
This paper describes basic characteristics of dredging, application of dredging technology in the world beach placer mining, and dredging future.
本文摘要叙述有关三维紧致光滑流形上结构稳定的微分同胚的一个特征性定理的证明。
This note takes a sketch of a proof of a characterization theorem for diffeomorphisms oa a compact 3-dimensional smooth manifold to be structurally stable.
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