A cluster of seven stars in the constellation Ursa Major, four forming the bowl and three the handle of a dipper-shaped configuration.Also called Charles's Wain, Plow

北斗七星：大熊星座的七顆星組，其中四顆形成長(zhǎng)柄勺狀結(jié)構(gòu)的勺斗部分日韩毛片精品一区二区，另三顆形成其勺柄部分也作 Charles's Wain欧美在线AⅤ， Plow

Nevertheless, many people devoted their attention to the plow, until in 1869, James Oliver of South Bend, Indiana, turned out the first chilled-steel plow.

不過(guò)，也有許多人把注意力投向了犁爆操女人，直到1869年日韩制服无码一区福利，印第安州南部的詹姆士，奧利弗生產(chǎn)出了第一具冷凍鐵犁农村老熟女乱子视频。

In this paper, the development situation and level of driving disk plow at home and abroad are introduced and their market prospects are analysed. A proposal of further developing the products of driving disk plow in China is put forward.

本文介紹了驅(qū)動(dòng)式圓盤(pán)犁的國(guó)內(nèi)外研制情況與水平看大黄片国产精品，并對(duì)市場(chǎng)前景作了分析，提出在國(guó)內(nèi)進(jìn)一步開(kāi)發(fā)有關(guān)驅(qū)動(dòng)式圓盤(pán)犁產(chǎn)品的建議亚洲精品无码AV一二三四区。

This paper analyses and calculates the plow parameters about two kinds of high speed plows LEMKEN and KUHN, and studys the relation between the geometric parameters of shape of moldboard plow surface and soil properties, plowing quality, forces properties, plowing speed, resistance and energy dissipation during the plowing. Then according to the direction of developing high efficiency and saving-energy agriculture, under the premise of good farming quality this article puts forward a kind of method setting the mathematics model about plow resistance through the new cultivation principle and the new design principle.

本文通過(guò)對(duì)比分析的手段對(duì)LEMKEN和KUHN兩種高速犁參數(shù)兩種犁體曲面參數(shù)進(jìn)行量化分析計(jì)算黄片在线播放中文，分析犁體曲面形狀的幾何參數(shù)與耕后質(zhì)量、土壤的力學(xué)特性成年日本片黄网站色视频、耕速欧美人妻一区二区、阻力和功率消耗等相關(guān)關(guān)系，結(jié)合目前高效節(jié)能型農(nóng)業(yè)的發(fā)展方向欧美性交免费资原站，提出在保證作業(yè)質(zhì)量的前提下色久资源视频，應(yīng)用新型耕作理論和新型設(shè)計(jì)理論建立牽引阻力數(shù)學(xué)模型。

While traditional farming experiences and preliminary experiments on minimum tillage showed a preference of alternating furrow slice inverting and deep loosening without inverting in some of the agricultural regions in China, the development of a PTO driven furrow slice inverting rotary plow as primary tillage implement inplace of the conventional moldboard plow was justified from the standpoint of less tractor traffic, less soil compaction, less energy consumption, sowing in time etc.

從翻耕或翻耕與深松相交替將在相當(dāng)廣大的地區(qū)黄色视频毛片在线看、相當(dāng)長(zhǎng)的時(shí)期內(nèi)老女人一级特黄大片，作為一種基本的田間作業(yè)環(huán)節(jié)而存在這一認(rèn)識(shí)出發(fā)日本特級片，用"假想旋翻垡片"的概念研究了旋翻在幾何尺寸上的可能性及其限制條件ri99av，并從保省耕作法的節(jié)能一级毛片,黄片、趕農(nóng)時(shí)、省人工減少土壤壓實(shí)国家一级无码黄片、經(jīng)濟(jì)高效等方面對(duì)旋翻進(jìn)行了考察欧美性人妖XXXXⅩ极品，指出發(fā)展一種動(dòng)力驅(qū)動(dòng)、原溝旋轉(zhuǎn)翻垡的基礎(chǔ)耕具的必要性和可行性亚洲免费人成视频观看。

This paper makes the soil movement be four sections: a Cutting soil with edge; bThe soil movement along the plowshare and plow chest's below surface; c The soil movement along the plow cliff ;dThe soil movement beyond the plow in the course of farming in order to study the force of moldboard plow surface.

本文在研究犁體曲面受力時(shí)国产人人夜夜，把犁耕時(shí)土垡的運(yùn)動(dòng)分為四個(gè)階段：a 用鏵刃切開(kāi)土垡；b 土垡沿犁鏵和犁胸下部曲面運(yùn)動(dòng)91久久精品无码一区二区毛片；c 土垡沿犁壁運(yùn)動(dòng)A片在线观看网站免费不卡色欲；d 土壤超出犁壁曲面運(yùn)動(dòng)。

My company After years of efforts and development, further improve the quality of products, licensing Shuangjian shovel plow won a major national machine primers plow factory, the majority of new and old customers the confidence and love.

我公司經(jīng)過(guò)多年的努力和發(fā)展91视频免费播放，產(chǎn)品質(zhì)量進(jìn)一步提高午夜毛片www，雙劍牌犁鏟贏得了全國(guó)各大機(jī)引犁廠，廣大新老客戶(hù)的信任和厚愛(ài)无码人妻精品一区二区不卡。

My company in order to improve product quality to meet market demand and expand production scale, an increase of the production area and equipment, has been formed forging, roll forging heat treatment, quality inspection of the production line as a whole, so that the quality of products in full compliance with the National Technology Department required standard, on an annual output of 10,000 shovel plow, product quality are the key to better quality are "Shuangjian", it is entirely possible and comparable steel plow shovel.

我公司為了產(chǎn)品質(zhì)量的提高二级黄A毛片免费视频观看，滿(mǎn)足市場(chǎng)的需求，擴(kuò)大了生產(chǎn)規(guī)模欧美在线观看精品，增加了生產(chǎn)占地面積和設(shè)備亚洲国产区中文在线观看www，已經(jīng)形成了鍛造、滾鍛熱處理午夜三级亚洲、質(zhì)量檢測(cè)為一體的生產(chǎn)線外国性交网，使產(chǎn)品質(zhì)量完全符合國(guó)家技術(shù)部門(mén)要求的水準(zhǔn)，年產(chǎn)犁鏟上萬(wàn)片欧美乱论电影，產(chǎn)品質(zhì)量是關(guān)鍵国产三级电影免费，質(zhì)量更好的是"雙劍"，它完全可以和犁鏟鋼相媲美www.色一区二区。

My company's products have wide range of automotive steel, agricultural machinery parts, shovel plow, plow side panels and a variety of films and 60,70 harrow bulldozers shovel blade, but also to undertake a variety of mines, railways, automotive forgings business.

我公司產(chǎn)品有各種車(chē)型的汽車(chē)鋼板欧美一级A片免弗看、農(nóng)機(jī)配件、犁鏟狼狼综合久久久久综合网、犁側(cè)板及各種規(guī)格的耙片和60jizz污污视频免费看、70推土機(jī)鏟刃，還能承接各種礦山免费视频XNXX在线观看、鐵路激情小说在线视频观看、汽車(chē)鍛件業(yè)務(wù)。

Shuangjian licensing plow shovel high quality and low price, I produced Shuangjian licensing Road mill with plow shovel manufacturing, licensing Shuangjian plow shovel as sharp as the sword, tenacity wearable, Shuangjian plow shovel is your best option.

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