Dry-type transformers require minimum maintenance and provide long years of trouble-freeservice.
干式变压器的最低要求，并提供免费维修服务多年的麻烦。
2
As a result dimensioning to the Max. Load in the fully extended position gives reasonable guide dimensions and trouble-freeservice.
因此，在全伸长下最大载荷的所给定的尺寸是合理的导向件尺寸并可保证免于维护。
3
Beijing, for instance, found itself in great traffic trouble when the city announced to provide free metro service for its citizens during the Asian Games in 1990.