a larger harbor crane is often costly and maintenance charge is larger.
大型港口起重机往往价格昂贵,成本高且维护费用大。
it doesn't only reduce the maintenance charge and prolong the maintenance interval, but also extends the life span of condenser which can increase the economic benefits for the power plant.
在降低维修费用、延长维修间隔的同时,也使凝汽器的使用寿命大大延长,可增加电厂的经济效益。
it is a type of economical aptitude pump unit which usually save energy over 50% than general models with convenient maintenance, simple adjustment, low maintenance charge on the safe side.