顺服

The steel is provided with the characteristics of ultra fine grain and ultra purity, so the result has the excellent mechanical properties with combination of strength and toughness. DC flash butt welding is a kind of solid joining method with high efficiency. The micro characteristics of HAZ affect the weld joints greatly.

直流电阻闪光对焊是一种高效的固态连接方法，其焊接热影响区的显微特性对焊接接头的性能有着重要的影响，由于这种方法与熔化焊具有本质的区别，所以对超细晶粒钢的闪光对焊焊接适用性研究会有助于推进新一代钢铁材料的研究和应用开发。

Section 2 simply analyzes the relationship between throughput and retransmission attempts, and describes the proposed P-DCF access mechanism.

第 2 节只是分析在生产和再传输之间的关系尝试，而且描述被提议的 P-DCF 存取机制。