97型25Hz相敏轨道电路系统轨道变压器有（）等几种类型。 ["BG2-130\/25","BG3-130\/25","BG-R130\/25","BG2-R130\/25"]
简述遗赠扶养协议的概念及其意义。
（）does not belong to the mooring trial item. ["generator sets running trial","shafting intensity trial","the trail for pumps that working for ME","ME safety devices trial"]
6502集中GJJ3-4线圈励磁电路故障会出现什么问题？
柞表修正法确定加工余量（），目前已被广泛采用。 ["准确可靠","比较可靠","计算迅速","方法简便","科学","有效"]
网络体系结构
