direct current component是什么意思

用法例句

This paper introduces the position and function of provincial forest areas in the forestry development history of Shanxi Province,expounds the necessity and urgency of the reform and development approaches of provincial forest areas,and advances some reform approaches and developing directions of provincial forest areas.

介绍了省直林区在山西林业发展史上的地位和作用,阐述了省直林区的改革和发展的必要性和紧迫性,提出了省直林区的改革途径和发展方向。