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[硕士论文] [学位论文]中北大学硕士学位论文-发动机曲柄连杆机构多体系统动力学仿真研究

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发表于 2013-4-24 09:49:42 | 显示全部楼层
Mandako Land Roller was developed in Canada for use in raising peas and edible beans, said distributor Stewart Peterson of West Fargo, N.D. Crop harvests were hindered by small rocks in the field and the big roller was developed to push the rocks into the soil. The latest issue for farmers is ridding fields of corn plant residue in preparation to planting soybeans. The huge rollers are used to flatten the soil surface.
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发表于 2013-4-24 20:07:02 | 显示全部楼层

来了解下

来了解下了。不错支持
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发表于 2013-5-30 19:39:16 | 显示全部楼层
压缩后再传上来看看
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发表于 2013-6-19 22:00:50 | 显示全部楼层
为了论文赚分鸟
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