摘要：本文根据教学实践,提出设计预习的四个要素：预习要让学生把握目标、找到方法、各有所得、心有所思,从而提升学生自主阅读的有效性。

摘要：Experimental study was carried out on the in-plane bending behavior of glass plates without lateral supports, and the effects of the factors, such as height-to-span ratio, on the stability of glass panels were studied. Results show that the in-plane bending glass plates with both ends simply supported and their upper edge free lose overall stability under loads, which belongs to the limit-point type of instability. It is found that the buckling load increases linearly with the increase of height-to-span ratio of the glass plates. The lateral stress of in-plane bending glass plates without lateral supports increases linearly under loads; while the large-area stress increases nonlinearly and the lateral stress is not the controlling factor of instability. In finite element analysis, the first buckling mode is regarded as the initial imperfection and imposed on the model as 1/1000 of the span of the components. The numerical buckling load according to the theory of large deflection is less than the experiment result, which is more conservative and can provide some reference for design. For the design method, when the in-plane load is imposed on the glass plate, its lateral strength and the deflection should be verified. Considering the stability of the in-plane bending glass plate without reliable lateral support, buckling is another possible failure mode and calls for verification.

摘要：对柴河林业局宏升林场药用植物的调查结果,从种类、林分类型、立地型、蕴藏量进行了分析。

摘要：我国野生花卉资源极其丰富,野生花卉的驯化和栽培繁殖源远流长,举世闻名,今天仍有许多人从事这方面的工作,但我国野生花卉的利用还远远不够.在一些发达国家,如美国、英国、联邦德国、法国、瑞士、澳大利亚等国家野生花卉的栽培研究很流行.我们牡丹江地区野生花卉资源也同样没有很好的开发利用,绿化用花卉种类较少,常见的有:翠菊、一串红、三色堇、鸡冠花、金鱼草、大丽花、蜀葵、萱草、荷包牡丹、鸢尾、唐菖蒲、紫茉莉、万寿菊、石竹、金盏菊、半支莲、凤仙花、醉蝶花、虞美人、矮牵牛等30种左右,要克服园林观赏植物单调的缺点,必须开展野生观赏植物引种驯化工作.