【正文】 alleys. We were both surprised to learn that half of the river is in China. After it leaves China and the high altitude,the Mekong bees wide，brown and warm. As it enters Southeast Asia, its pace slows. It makes wide bends or meanders through low valleys to the plains where rice grows. At last, the river delta enters the South China Sea.10% 50HZ用于加熱器及控制系統(tǒng) 單相 220V177。 特殊結(jié)構(gòu)的成型機頭,使內(nèi)?外層壁厚均勻,成型穩(wěn)定,并且具有內(nèi)壁厚度可調(diào)功能。A NIGHT THE EARTH DID’T SLEEP In the early evening we always stop to make put up our tent and then we eat. After supper Wang Wei put her head down on her pillow and went to sleep but I stayed awake. At midnight the sky became clearer and the stars grew brighter. It was so quiet. There was almost no wind—only the flames of our fire for pany. As I lay beneath the stars I thought about how far we had already travelled. I am fond of my sister but she has one serious shorting. She can be really stubborn. Although she didn39。 it was a wonderful journey of discovery. The largest dictionary in the world is the Oxford English Dictionary, or OED for short. The idea for this dictionary came from an important meeting in Britain in 1857. Twentytwo years later, Oxford University asked James Murray to be the editor of its new dictionary. Several months before our trip,Wang Wei and I went to the library. We found a large atlas with good maps that showed details of world geography. From the atlas we could see that the Mekong River begins in a glacier on a Tibetan mountain. At first the river is small and the water is clear and cold. Then it begins to move quickly. It bees rapids as it passes through deep valleys, travelling across western Yunnan Province. Sometimes the river bees a waterfall and enters wide valleys. We were both surprised to learn that half of the river is in China. After it leaves China and the high altitude,the Mekong bees wide，brown and warm. As it enters Southeast Asia, its pace slows. It makes wide bends or meanders through low valleys to the plains where rice grows. At last, the river delta enters the South China Sea.The next morning our group slept late. We were very tired from the long bike ride the day before. Cycling in the hills had been our couins had the chance to make jokes about Wangwei and me. Perhaps,they said,they were the strong ones!We had lunch at a nice outdoor cafe,then rode out of the city.,表3:雙壁波紋管?空壁纏繞管?水泥管改良于價格比較(單位:元)規(guī)格雙壁波紋管(S1系列)空壁纏繞管(S1系列)水泥管重量kg/m價格施工費用綜合費用重量kg/m價格施工費用綜合費用重量kg/m價格施工費用綜合費用225452570406675107182300703010045100801202004001104015011143602031831161602765001316555220752671391803196001924072312263381004384003002005007002532095415303901345245504122506628003242011053040600168768650485300785表4:雙壁波紋管?空壁纏繞管?水泥管性能比較(以800mm為例)雙壁波紋管(S1系列)空壁纏繞管(S1系列)水泥管產(chǎn)品類別柔性管柔性管剛性管使用壽命50年以上50年以上20年左右每米價格420元600元485元施工費用110元/m168元/m300元/m工程綜合造價530元/m768元/m785元/m結(jié)構(gòu)受外壓變形,但不易損壞受外壓變形,但不損壞受外壓及鋪設(shè)不平均能破損施工費用重量輕?鏈接迅速?方便,搬運輕便,重量較重?連接不太方便,重量最重(200kg/m),連接不方便?不可靠?施工耗力?耗材,連接方式承插?哈夫塊聯(lián)接熱縮膜?熱熔鏈接凹凸企口結(jié)合用水泥理化性能而沖擊?耐腐蝕?不漏水?耐寒性高?耐磨性強?壽命長而沖擊?耐腐蝕?不漏水?耐寒性高?耐磨性強?壽命長重量重?耐沖擊低?受壓已損壞?漏水?耐化學(xué)性差產(chǎn)品特點1?重量輕,成本低,具有很強的市場競爭力?同中空壁纏繞管?纏繞成型式肋管相比,在相同管徑,相同環(huán)剛度下,單米重量最輕,可節(jié)省材料40~70%?2?連接方便?可靠,可采用彈性密封圈承插聯(lián)接(排水?排污?通風(fēng)等用途),也可采用密封圈外加哈夫塊連接(供水等用途)?3?HDPE雙壁波紋管具有優(yōu)異的耐低溫性,可在60℃~60℃下施工?4?制品的整體強度高,具有較大的軸向拉伸強度,能承受較大的與軸向拉伸力和周向的環(huán)應(yīng)力?5?具有很強的土壤適應(yīng)性?由于HDPE的斷裂延伸率可達500%?所以對地基的不均勻沉降?土層變動均具有很強的適應(yīng)性?6?流通性能優(yōu)越?內(nèi)壁光滑,流動阻力小,相同管徑下,比水泥管的流量更大?7?具有很高的耐磨性和耐腐蝕性,使用壽命長達50年之久,而水泥管在正常條件下的壽命為20年左右?8?屬于綠色環(huán)保產(chǎn)品,由于HDPE可完全回收,故不對環(huán)境造成污染?產(chǎn)品用途1?可廣泛用用于市政建設(shè)的排水?排污等管道系統(tǒng)2?農(nóng)田?水利灌溉?輸水?排澇等水利工程?3?化工?礦山用于流體的輸送以及通風(fēng)管等用途?4?地下管線的保護套管和通信電纜套管等用途?5?工廠?污水處理廠以及其他公共場所的管道?四?管材聯(lián)接管材可通過使用密封插接,或彈性密封圈加哈夫外固件連接等形式連接: 彈性密封圈承插聯(lián)接:彈性密封圈加哈夫塊外固聯(lián)接:五?機組規(guī)格參數(shù)及特點SBG600型雙壁波紋管設(shè)備組成:一、 生產(chǎn)線主要技術(shù)參數(shù) 使用的樹酯:高密度聚乙烯 裝機容量:400KW,常用容量:300KW 生產(chǎn)能力:600KG/HR 生產(chǎn)線速度: 操作方向:從右各左 設(shè)備顏色:綠色二、 設(shè)備組成1?SJPE75/33單螺桿擠出機(內(nèi)層擠出) 8臺2?SJPE90/33單螺桿擠出機(外層擠出) 8臺3?自適應(yīng)模頭支架 8臺4?復(fù)合擠出模頭 24套5?波紋成型機(配模塊) 8臺6?西門子PLC控制系統(tǒng) 8套7?牽引噴淋冷卻水槽 8臺8?堆放機 8臺9?隨機專用工具 8套三、 機組特點 該生產(chǎn)線設(shè)計先進,配置高檔,技術(shù)領(lǐng)先,生產(chǎn)效率高,配合公司PE高效擠出機,確保高速生產(chǎn)。4棟標準化廠房,建筑面積10000平方米,投資600萬元。t。PART 6 THE END OF OUR JOUNEY At3:42 am everything began to seemed as if the world was at an end!Eleven kilometres directly below the city the greast earthquake of 20th century had begun. It was felt in Beijing,which is more thantwo hundred kilometres。 it also had wide streets with trees in rows and old