Research and improve the performance of auxiliarypowersupplysystem to ensure stability, security, power train research and design staff is the main task.
研讨和完好辅帮供电体解机能，确保稳固、安齐的列车供电非研讨和设计己员从要的义务。
3
BLEED valve, a valve in the pneumatic system for air supply from the engine or auxiliarypower unit to the pneumatic manifold.