铜合金绞线承力索的机械强度安全系数不应小于()。 ["2.0","2.5","3.0","4.0"]
目前爱国统一战线的基本任务是() ["争取完成统一大业","与中共互相监督","巩固工农联盟","坚持四项基本原则"]
可动心轨辙叉直股工作边直线度为()。 ["A、0.3mm/1m","B、0.4mm/1m","C、0.5mm/1m","D、0.6mm/1m"]
可动心轨辙叉长度(沿工作边的长度)允许偏差为()。 ["A、±4mm","B、±3mm","C、±2mm","D、±1mm"]
按组织形式划分,旅游的类型可分为:() ["团体旅游","消遣旅游","散客旅游","包价旅游","观光旅游"]
多级直流放大器的级间耦合方式是()