中俄中朝国境河流水上交通事故调查处理
Investigation and Settlement of Traffic Accidents Happening in the Boundary Rivers of China and Russia China and Korea
事故／事故征候调查
accident and incident investigation
交流交换系统
countercurrent exchange system
直流交流变换器
direct-current-alternating-current converter
直流交流叠加法
AC and DC inductive methods