三角坑(基长2.5m):根据水平测量值,每隔()轨枕计算水平变化率。 ["一根","二根","三根","四根"]
电力系统发生故障、并网点电压出现跌落时,风电场应动态调整()。 ["机组无功功率","场内无功补偿容量","A和B","都不对"]
调车作业中,调车人员上车时的速度最高不得超过()。 ["20km/h","15km/h","10km/h","30km/h"]
票额申请时有新的通知消息,按快捷键()查询。 ["Ctrl+N","Ctrl+J","Ctrl+A","Ctrl+I"]
风力发电机出口电压通常为()。 ["380V","690V","1100V","35kV"]
试论述犯罪学的学科性质。