unmaintenance battery

The structure and maintenance of unmaintenance battery;

免维护蓄电池的结构特点及其使用与维护

Out of the wrong thoughts of substation free maintenance storage cell;

走出变电站免维护蓄电池的维护误区

The paper designs a kind of high-voltage vacuum circuit-breaker with good performance,and free maintenance.

设计了一种高性能、免维护的高压真空配电装置,为实现井下变电所无人值守奠定基础。

Research and development of starting maintenance free lead acid battery for locomotive;

内燃机车启动用富液免维护铅酸蓄电池的研制

Standard of maintenance free lead acid storage battery used for starting;

试论起动用免维护铅酸蓄电池标准

The practical synchronous generator designed with rare earth permanent magnetic material has notable advantages of small volume,lighter weight,excellent electric performance index,dusting and fording,energy saving;maintenance free,high efficiency etc.

采用稀土永磁材料设计的实用型同步发电机,具有体积小、质量轻、电性能指标优良、防尘涉水、免维护、效率高、节能效果显著等优点,可广泛用于航空航天、国防、工农业生产和日常生活的各个领域。