What should be done if a company decides to stop doing business with a vendor？ （） [" Notify buyers using Workflow."," Delete the Company Master record."," Set the Company record status to DISQUAL."," Check the Disqualified Vendor check box on the Company record."]
馈线从馈线窗上方进入机房或水平进入机房：室外铜排上沿应低于馈线窗下沿（） ["10cm","500mm","200mm","600mm"]
大型城市是指非农业人口在（）万以上的城市 ["20","30","40","50"]
砌筑砂浆中，水泥用量不应（）。 ["小于400kg\/m3","小于300kg\/m3","小于250kg\/m3","小于200kg\/m3"]
下列不属于方向控制回路是（）。 ["换向和闭锁回路","调压和卸载回路","节流调速和速度换接回路","顺序动作回路"]
简述基本草原保护制度的主要内容。
