工作疲劳的

The calculation results show that the temperature of the valve cone changes periodically, leading to thermal stress changes periodically, which is the main reason of the valve cone pit corrosion; the operating temperature of the valve can be reduced by using the higher thermal conductivity materials; at the Same time, 3-D FEM provides a good theoretical basis in the process of the design and improvement for the parts of ICE.

计算结果表明：气门锥面处周期性的温度变化，会导致周期性变化的热应力，是导致气门锥面疲劳点蚀的主要原因；采用较高导热系数的材料可降低气门的工作温度；同时，三维有限元法能为内燃机零部件的进一步设计改进提供很好的理论依据。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。