In the eastern monsoon region , transition of summer rainfall from below normal to above normal in the lower yangtze river in 1979 was accompanied with dry trends in north china and south china 与全球增暖相联系的是：我国微量降水在空间上表现为一致的减少趋势，我国北方寒潮事件显著减少，冷夜和冷日的减少与暖夜和暖日的增多并存，以及极端强降水有增多的趋势。
Combined with a concrete face rock - fill dam in process , the simulation analysis on the face slab ' s temperature field and temperature stress is processed in connection with the condition of temperature sudden drop caused by daytime temperature differences and cold wave and so on during the construction period 摘要结合某在建的混凝土面板堆石坝，针对施工期日温差及发生寒潮等气温骤降情况，进行了气温骤降条件下面板温度场及温度应力的全过程仿真分析。
The effect of cold wave , layer thickness of construct and sluice to temperature field and stress field are studied . this paper analysis the effect of the first stage cooling and the second stage cooling . pertinent measures of temperature control and crack prevention are suggested , settling the practice problems in projects 重点研究了寒潮、浇筑层厚和蓄水等对拱坝混凝土温度场和应力场的影响；对坝体一期冷却和二期冷却的冷却效果进行了详细分析；并针对性地提出了相应的温控防裂措施，以解决工程实际问题。
Synthetic analysis of cold wave processes indicate that northeast china is mainly influenced by the cold air from balkan lake and e sea . from the point of 1000hpa , the incidence of cold wave in the southern liaoning , the eastern jilin , and inner mongolia southeast are affected by inner mongolia high , while in heilongjiang by the deepen and strengthen of low pressure in northeast china 通过对寒潮过程的合成分析发现东北地区春季主要受来自贝加尔湖和鄂海的冷空气影响，从低层1000hpa来看，辽宁、吉林、内蒙古东南部的强降温事件是由于蒙古高压强烈发展造成的，而黑龙江地区的强降温是由于东北低压加深、加强造成的。
Insurance company manages insurance wu to want to face various risks , include the catastrophe venture that at present manpower still cannot defy , like typhoon , rainstorm , hail , cold wave , arid , flood , earthquake , mud - rock flow , avalanche , coast , use conflagration of plant plant diseases and insect pests , forest , epidemic disease , etc , the assessment of consequence of the computation of its premium rate , calamity 保险公司经营保险业务要面对各种各样的风险，包括目前人力尚无法抗拒的巨灾风险，如台风、暴雨、冰雹、寒潮、干旱、洪水、地震、泥石流、雪崩、滑坡、动植物病虫害、森林大火、流行病，等等，其保险费率的计算、灾难后果的评估。
