不同规模的牛场，主产品利润率以中型规模(100 ~ 499头)牛场最高，为18.02%，大型牛场经营管理水平有待提高。
The main production profit margin of medium-sized (100 ~ 499 head) feedlot was 18.02%, and highest among different scale feedlots. The management level of large-scale feedlots must be improved.
华北神头地区安全稳定控制系统是最新设计、研制的一套集中型区域电网安全稳定控制系统。
The Shentou District Stability and Security Control System is a newly designed and developed Centralized Control System for District Network.
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