在没有表面处理状态下的焊接状况
Spot welding conditions for bared
交通状况冲撞总图
traffic combined condition collision diagram
交通状况特征
traveling characteristics
交通状况图
traffic condition diagram
区域交通状况
region transportation situation
α-γ型异种钢焊接接头
dissimilar steel welded joint
安全直接通信
secure direct commurication