Butt Weld and docking and corner combinations Weld, in Weld ends located arc plate and extraction plate in igniting board then leads to the welding seam, joint halfway shall weld joints in front of 2.0 mm Department Firing arc, welding pieces after preheating rod will return to weld the origin, pool filled to the required thickness, before forward welding; Welding speed : Isokinetic welding requirements to ensure weld thickness, width uniform, which masks to look for hot metal and slag bath equidistance (2-3 mm)%; Arc welding rod length : different models and determined that the general requirements of arc length is stable, acid electrode generally 3-4 mm, 2-3 mm normally alkaline electrode%; Welding perspective : According to determine the thickness of two pieces of welding, welding angle has two aspects : First, the angle between the direction of the rod and welding of 60-75 ; The second is the angle between two electrodes and welding around, the same thickness as welding, welding and welding pieces incident angle of 45 ; When the thickness ranging from welding, welding electrode and thick and thin pieces of welding electrode side angle greater than the angle between the side pieces; Arc : admission to the end of each weld should be filled crater, in the direction opposite to the direction of the back-arc welding, arc welding unchanged inside pit in 1974, to prevent the crater bite of meat.

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Based on the field investigation in Aug 2001 and Aug 2002, digital China Vegetation Map in 2001 and Qinghai-Xizang Plateau Vegetation Regionalization Map in 1996, vegetation characteristic along two sides of Qinghai-Xizang highway and railway is studied in this article Meanwhile, the impacts of Qinghai-Xizang highway and railway constructions on the ecosystems are analyzed using ARCVIEW欧美视频二区网站、ARC/INFO and PATCH ANALYSIS It was found that:(1) Qinghai-Xizang highway and railway span 9 altitudes,12 longitudes and 6 natural regions (East Qinghai and Qilian mountain steppe region, Chaidamu mountain desert region, South Qinghai alpine meadow steppe region, Qiangtang alpine steppe region, Guoluonaqu alpine scrub meadow region and South Xizang mountain shrub steppe region);(2) the constructions of Qinghai-Xizang highway and railway destroyed natural vegetation and landscape, especially in 50m-wide buffer regions along both sides of the roads, it was estimated that the Primary Productivity deceased by about 30504.62t/a and the gross biomass deceased by 432919.25～

：根據(jù)2001-08和2002-08月野外調(diào)查數(shù)據(jù)及2001年1∶100萬中國植被圖、1996年1∶400萬青藏高原植被區(qū)劃圖和2000年青藏鐵路沿線自然保護區(qū)分布及功能區(qū)界調(diào)整圖欧美喷水大屁股，以青藏公路鐵路沿線植被生態(tài)系統(tǒng)為研究對象18禁止黄片，運用ARCVIEW和ARC/INFO軟件研究青藏公路鐵路建設(shè)對沿線生態(tài)系統(tǒng)結(jié)構(gòu)的影響，結(jié)論如下：①青藏公路鐵路南北跨越9個緯度大陆视频国产精品短视频，東西跨越12個經(jīng)度黄片干净无码A片，共穿越青東祁連山地草原地帶、柴達木山地荒漠地帶爱爱视频午夜福利、青南高寒草甸草原地帶女生自慰出水网站、羌塘高寒草原地帶、果洛那曲高寒灌叢草甸地帶和藏南山地灌叢草原地帶6個自然區(qū)性欧美xxxx，對植被類型的統(tǒng)計結(jié)果顯示了地帶性国产精品第一页福利在线。②青藏公路鐵路的建設(shè)對生態(tài)系統(tǒng)產(chǎn)生直接的切割，使景觀更加破碎91色热热。

Taking a winter wheat field (4 400 m2) of Jinghai county seed farm as experimental plot,sampling by regular grid with with 10 m ×10 m grids,48 sample points were oriented by GPS receipt machine to analyze soil water content at the depth of 0~20 and 20~40 cm in pri-winter,jointing stage and filling stage of winter wheat.The spatial distribution map of soil water of the winter wheat field using geostatistical analyst model of ARC/INFO was drew.And the spatial variability of soil water in vertical and horizontal direction was analyzed.The results could offer scientific evidence for the deciding of the exact time and quantity for winter irrigation.

以天津市靜貉侵奕顺稍谙吖劭赐静豢ǎ縣良種場內(nèi)一塊長約110m，寬約40m的冬小麥田作為試驗區(qū)欧美性爱YY特黄特黄免费大片，采用規(guī)則格網(wǎng)采樣国产18av视频，按照10 m ×10m設(shè)置格網(wǎng)，共設(shè)48個采樣點黄色网站视，通過GPS手持機進行定位4455永久在线播放，分別于小麥越冬前、拔節(jié)期人人操人人插人人搞、灌漿期国产性爱一级视频，利用便攜式土壤濕度數(shù)據(jù)采集器對試驗地各個采樣點0~2018岁进看的黄色网站、20~40 cm 2種深度土壤含水量進行了測定，利用ARC/INFO的地統(tǒng)計分析模塊繪制了冬小麥3個不同生育期試驗區(qū)土壤水分空間分布圖欧美精品一区二区三区在钱，并分析了其垂直和水平方向的空間變異特征人人操黄色，以期為確定最佳灌溉時機和灌溉量提供科學(xué)依據(jù)。

The function of active view analysis on ARC/INFO is surveying land-form features of a selected fight line. The fight line is generated by critical points that the user selects.

ARC／INFO動態(tài)視點分析是動態(tài)觀察分析地形圖上某條路線的地形特點日本黄网址免费在线观看，該路線是以用戶所選取的臨界點為基礎(chǔ)形成的九九精品在线观看。

The Aggressive ReConnaissance-170 starfighter, also known as the ARC-170 starfighter, was a heavy starfighter/bomber that saw widespread use by the Republic Navy in the later days of the Clone Wars.

以ARC-170宇宙戰(zhàn)斗機而為人所知的攻擊-偵察170戰(zhàn)斗機是在復(fù)制人戰(zhàn)爭末期共和國海軍所廣泛使用的重型戰(zhàn)斗轟炸機。同時也是未來義軍聯(lián)盟主力的T-65 X翼戰(zhàn)斗機的前身

We love to hear about the story, Moses and Joan of Arc and Spider-Man.

我們喜歡聽那些故事亚洲国产一区二区乱999，如Arc的Moses和JoanA∨女人网，蜘蛛俠。

We love to hear about the story, Moses and Joan of Arc and Spider-Man.

我們喜愛聽這類故事久久黄片18，如 Moses 日韩欧美色， Joan of Arc 及蜘蛛俠。