【正文】 Cambodia was in many ways similar to Laos, although it has twice the population. At another inn, we talked with a teacher who told us that half of the people in her country couldn’t read or write. Her village couldn’t even afford to build a school, so she had to teach outside under a large tent. When we said goodbye, we all felt very lucky to have studied in on the road, we passed between many hills and forests. Then we came to the plains and entered Phnom Penh,the capital of Cambodia. In many ways it looked like Vientiane and Ho Chi Minh City。Unit 3 全線采用西門(mén)子PLC控制系統(tǒng),自動(dòng)化程度高,控制精確,運(yùn)行可靠,操作簡(jiǎn)便。PART2 A NIGHT IN THE MOUNTAINSuntil the time of the late Qing Dynasty. There men did most of the important early work on dictionaries: Samuel Johnson, Noah Webster, and James Murray. These men spent nearly all of their lives trying to collect words for their dictionaries. For them, it wasn’t only a job。Although it was autumn,the snow was already beginning to fall in legs were so heavy and cold that they felt like blocks of you ever seen snowmen ride bicycles?That’s what we looked like! Along the way children dressed in long wool coats stopped to look at the late afternoon we found it was so cold that our water bottles froze..However,the lakes shonelike glass in the setting sun and looked rode in front of me as is very reliable and I knew I didn’t need to encourage her. To climb the mountains was hard work but as we looked around us, we were surprised by the view. We seemed to be able to see for miles. At one point we were so high that we found ourselves cycling through clouds. Then we began going down the hills. It was great fun especially as it gradually became much warmer. In the valleys colourful butterflies flew around us and we saw many yaks and sheep eating green grass. At this point we had to change our caps, coats,gloves and trousers for Tshirts and shorts. 雙壁波紋管內(nèi)外層采用二臺(tái)高效擠出機(jī)分別擠出成型,既可生產(chǎn)外壁不同顏色的管材,又可分層使用回收料,降低生產(chǎn)成本。JOURNEY DOWN THE MEKONG it also had wide streets with trees in rows and old French Vientiane, ships could travel the Mekong River the center of the city we visited the palace and a beautiful white elephant. It can only be seen outside the palace on special days. We ate an early supper and went to see a great temple with floors made of sliver.PART 6 THE END OF OUR JOUNEY,表3:雙壁波紋管?空壁纏繞管?水泥管改良于價(jià)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(jià)格施工費(fèi)用綜合費(fèi)用重量kg/m價(jià)格施工費(fèi)用綜合費(fèi)用重量kg/m價(jià)格施工費(fèi)用綜合費(fèi)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(jià)格420元600元485元施工費(fèi)用110元/m168元/m300元/m工程綜合造價(jià)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(fèi)用重量輕?鏈接迅速?方便,搬運(yùn)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(qiáng)?壽命長(zhǎng)而沖擊?耐腐蝕?不漏水?耐寒性高?耐磨性強(qiáng)?壽命長(zhǎng)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(diǎn)1?重量輕,成本低,具有很強(qiáng)的市場(chǎng)競(jìng)爭(zhēng)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(qiáng)度高,具有較大的軸向拉伸強(qiáng)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(qiáng)的土壤適應(yīng)性?由于HDPE的斷裂延伸率可達(dá)500%?所以對(duì)地基的不均勻沉降?土層變動(dòng)均具有很強(qiáng)的適應(yīng)性?6?流通性能優(yōu)越?內(nèi)壁光滑,流動(dòng)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(zhǎng)達(dá)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(duì)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(hù)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(chǎng)所的管道?四?管材聯(lián)接管材可通過(guò)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(jī)組規(guī)格參數(shù)及特點(diǎn)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(shù)酯:高密度聚乙烯 裝機(jī)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(jī)(內(nèi)層擠出) 8臺(tái)2?SJPE90/33單螺桿擠出機(jī)(外層擠出) 8臺(tái)3?自適應(yīng)模頭支架 8臺(tái)4?復(fù)合擠出模頭 24套5?波紋成型機(jī)(配模塊) 8臺(tái)6?西門(mén)子PLC控制系統(tǒng) 8套7?牽引噴淋冷卻水槽 8臺(tái)8?堆放機(jī) 8臺(tái)9?隨機(jī)專用工具 8套三、 機(jī)組特點(diǎn) 該生產(chǎn)線設(shè)計(jì)先進(jìn),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(jī),確保高速生產(chǎn)。 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,