The antique city gate and the still remaining circumvallation with the scar of time's corrasion, are telling the beautiful legend of their times. 古旧的城门，保存完好的城墙带着风霜剥蚀的痕迹，诉说着远古美丽的传说。
It discusses the location and characteristics and causes for turbine low pressure cylinder,and suggests some measures of preventing &slowdown this corrasion. 对汽轮机低压缸腐蚀进行了论述,分析了低压缸腐蚀部位、特征及腐蚀机理,并提出了防止和减缓低压缸腐蚀的措施。
Four types of sequences model were identified in the Hetaoyuan Formation, BiYang depression: adequate supply source tectonic slope-brea, poor supply source tectonic slope-break , hinge margin and salt-lake model. The research on corrasion valley ? 将本研究区内的层序地层模式归纳为四种：充足物源构造坡折模式、少物源构造坡折模式、缓坡模式和盐湖模式，进一步又可细分为10种类型。
