在道岔中,防爬轨撑用于哪个部位?
安装腕臂时,起吊腕臂用的白棕绳的规格为() ["A.Φ10mm","B.Φ12mm","C.Φ14mm","D.Φ16mm"]
基床表层级配碎石室内试验指标() ["A、级配层级配","B、不均匀系数,0.02mm以下颗粒","C、洛杉矶磨耗率","D、粒径大于1.7mm颗粒的硫酸钠溶液浸泡损失率、粒径小于0.5mm的细颗粒的液限、塑性指数"]
根据《低压配电设计规范》,安装在生产车间和有人场所的开敞式配电设备,其未遮护的裸带电体距地面高度不应小于() ["2.5m","3.0m","3.5m","4.0m"]
目前链型悬挂安装型式——无冰,接触悬挂高度5800mm,结构高度1300mm的区间全补偿链形悬挂,一般拉杆底座与腕臂底座的间距为()。 ["2000mm","1900mm","2400mm","1550mm"]
什么是正向AGC?什么是反向AGC?