maintenance log保养时程表maintenancen.维修；维护；保持；生活费用；抚养费maintenance and repairs保养及修理maintenance application护养施肥maintenance expendituse维修费；维修开支Maintenance Test Module保养测试模件maintenance and support维修保障maintenance of nitrogen氮保存,氮的保存Maintenance Data Report维修数据报告maintenance supervision维护管理程序maintenance signal unit维护信号装置maintenance of waterway航道维护