The utility model discloses an activeridge-tillage and no-tillage corn seed planter which pertains to the technical field of agricultural machinery.
本实用新型公开了一种主动式玉米垄作免耕播种机，属于农业机械技术领域。
2
A high-pressure ridge that has set up over the Southern Plains has been really persistent there. It has pushed a lot of active or violent weather to the east.
阿尔恩特说，“在南部平原区形成的高压脊十分顽固，引起了其东部地区活跃甚至是猛烈的天气现象。”
3
Based on transmission line theory and extraction method of active impedance of waveguide slot, a simplified computation method for the leaky-wall ridge waveguide filter is presented in this paper.