fractional factorial design 分因子设计 frame plough 架式犁 Frankliniella tenuicornis Uzel. 玉米蓟马[ 缨翅目蓟马科昆虫,严重为害玉米,造成大批死苗,成体长1.3-1.5毫米,暗褐色, 幼虫红色。
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Subsoiling ploughAn automatic agricultural machinery with various functions. Made up of frame, pole, plough share, soil separating board, leading bogie and strengthening tie bar.
一种自动多功能深松犁属于农业机械，由架体总成、犁柱总成、铧片、分土板总成、导向架总成和加强拉杆总成组成。
The hydraulic reversing plough has the advantages of small rotation radius, flexible rotation, leveled soil plowing, good tillage effect, high plough frame intensity and high operation efficiency.
转动半径小、转动灵活，翻地平整，耕地效果好、犁架强度高，作业效率高。
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