农�在精选谷种时常用一种叫“风车 的农具进行分选在同一风力作用下谷种和瘪谷谷粒都从洞口水平飞出结果谷种和瘪谷落地点不同自然分开如图 Sketch Coloring Page

农�在精选谷种时常用一种叫“风车 的农具进行分选在同一风力作用下谷种和瘪谷谷粒都从洞口水平飞出结果谷种和瘪谷落地点不同自然分开如图 Template

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tomski农�在精选谷种时常用一种叫“风车 的农具进行分选在同一风力作用下谷种和瘪谷谷粒都从洞口水平飞出结果谷种和瘪谷落地点不同自然分开如图 coloring

农�在精选谷种时，常用一种叫“风车”的农具进行分选．在同一风力作用下，谷种和瘪谷空壳都从洞口水平飞出，结果谷种和瘪谷落地点不同，自然分开 sketch template

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在谷物收割和脱粒过程中小石子草�等杂物很容易与谷物混在一起另外谷粒中也有瘪粒为了将它们分离农�常用一种叫“风谷 的农具即扬场机进行 sketch template

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