The newly-adapted opera Zhaojun not only inherits the theme of strengthening the national unity since the Zhaojun play of Chao Yu’s and thereafter, but also puts in the modern ideas of humanity like eliminating wars and maintaining peace based on the reflection on this historical spirit.

Metro train is one of the most important components of urban rail transit,and scientific maintenance of metro train is the first priority to ensure the safe operation of URT.

For correct operation and maintenance of the Launcher diesel engine for buses, notice items during operation of the engine, such as selection of diesel oil, lube oil and cooling liquid, and requirements in engine starting and stopping, are illustrated, and maintenance details of the engine are described as well.

The principle of DR system and its planning maintenance;