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1.Optimum design for double-horse head beam pumping unit with rear horse head′s outline of spiral of Archimedes
阿基米德螺线双驴头抽油机优化设计收藏指正
2.The optimum design method is utilized to design 12-5-48HB double-horse head beam pumping unit with rear horse head ′s outline of spiral of Archimedes, and the optimum result is analyzed and compared with double-horse head beam pumping unit with rear horse head ′s outline of three-section circular arc and beam pumping unit.
用该优化方法对12-5-48HB型后驴头为阿基米德螺线双驴头抽油机进行了优化设计，并对优化结果和后驴头为三段圆弧的双驴头抽油机及游梁式抽油机进行对比分析。收藏指正
3.Brunet nature draws the outline of eye ministry outline, light color forms tall smooth effect, the combination of 3 kinds of color builds a stereoer and bigger, more abstruse, vivid double key point.
深色自然勾勒出眼部轮廓，浅色形成高光效果，三种颜色的组合营造出更大、更深邃、更立体生动的双眼。收藏指正
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