【正文】 s Day! in shops, hotels and restaurants. But few young women will mark the festival with their boyfriends, or take part in traditional activities to pray for cleverness. A largescale of exhibition on the Silk Road opened to the public in the National Museum on Thursday. The exhibition displays more than 400 treasures from Shaanxi province, Gansu province and 14 other regions. It is largest scale exhibition that shows the history of the Silk Road in recent years. As APEC is going on in Beijing, the exhibit aims to show the world this brilliant section of history. The Silk Road is a series of trade and cultural transmission routes that were central to cultural interaction through regions of the Asian continent. It connected the West and XXX 本科畢業(yè)設(shè)計（論文） 26 East by linking traders, merchants, pilgrims, monks, soldiers, nomads, and urban dwellers from China and India to the Mediterranean Sea during various periods of time. I met my dear hubby in 2021 the second year I was in my school and it was the first year when he came here. We became colleagues. And there was nothing special happening during that year. He was just a kind and humble brother graduated from the same college as me. 。s Day on February 14, characterized by bouquets of roses, chocolates and romantic candlelight dinners, than they do about their homegrown day for lovers. Even Qixi is nowadays referred to as the Chinese Valentine39。s misery, the cow told him to turn its hide into a pair of shoes after it died. The magic shoes whisked Niulang, who carried his two children in baskets strung from a shoulder pole, off on a chase after the empress. The pursuit enraged the empress, who took her hairpin and slashed it across the sky creating the Milky Way which separated husband from wife. But all was not lost as magpies, moved by their love and devotion, formed a bridge across the Milky Way to reunite the family. Even the Jade Emperor was touched, and allowed Niulang and Zhinu to meet once a year on the seventh night of the seventh month. This is how Qixi came to be. The festival can be traced back to the Han Dynasty (206 BCAD 220). Traditionally, people would look up at the sky and find a bright star in the constellation Aquila as well as the star Vega, which are identified as Niulang and Zhinu. The two stars shine on opposite sides of the Milky Way. Customs In bygone days, Qixi was not only a special day for lovers, but also for girls. It is also known as the Begging for Skills Festival or Daughters39。s largest virgin forest, and known for its spring and ecological environment, Arxan is marveled at by many tourists as the purest land on earth. You cannot miss out the Autumn of Arxan. It is definitely the best with brightlycolored scenery full of emotions. Autumn in the northern part of the country es earlier than the South. A September rain followed by the footprints of Autumn brings more colors to the once emerald green mountain and blooming grassland. Shutterbugs flock to see for themselves the marvel of splendid colors around the mountains and waters, many of whom have travel a long distance and even camp here only to capture a moment of the nature wonder. The silver birch turns golden, while the larch is still proudly green. You will find yourself drowned in the intoxicating red of the wild fruits as well as the glamour of flowers in full blown. And your heart will be lingering on the woods as it39。 基于 PLC 控制的城市污水處理系統(tǒng)的設(shè)計 25 請您刪除一下內(nèi)容， O(∩ _∩ )O謝謝?。?！ Many people have the same mixed feelings when planning a trip during Golden Week. With heaps of time, the sevenday Chinese 請您刪除一下內(nèi)容， O(∩ _∩ )O謝謝?。。?National Day holiday could be the best occasion to enjoy a destination. However, it can also be the easiest way to ruin how you feel about a place and you may bee more fatigued after the holiday, due to battling the large crowds. During peak season, a dream about a place can turn to nightmare without careful planning, especially if you travel with children and older people. As most Chinese people will take the holiday to visit domestic tourist destinations, crowds and busy traffic are inevitable at most places. Also to be expected are increasing transport and acmodation prices, with the possibility that there will be no rooms available. It is also mon that you39。衷心的感謝每位師生，謝謝你們給我的幫助與關(guān)懷，謝謝你們給了我一個美好的大學生活，謝謝你我的母校 ——XXX。 同時我也要感謝一路陪伴我的師友和我美麗的校園，在這里，我們共同生活了四年，四年里，有歡聲笑語，有酸甜苦辣，但是它讓我感受到了師生之間的歡樂，同學之間的友好，這些都是我人生道路上的財富。在這一段時間王老師抽出大量的時間來教導我，讓我感受到了她淵博的學識和高尚的品格，而且她嚴謹?shù)闹螌W態(tài)度以及兢兢業(yè)業(yè)的敬業(yè)精神，一直激勵鼓舞我不斷學習。運行實踐證明，與傳統(tǒng)繼電器控制相比，節(jié)省了大量時間繼電器、計數(shù)器及其他相關(guān)設(shè)備，提高了自動控制的準確性和可靠性，同時保障了設(shè)備的運行安全，收到了良好的經(jīng)濟效益和社會效益。其中 ,PLC 發(fā)揮了相當重要的作用。 總結(jié) 推進污水處理 并循環(huán)利用，從大的方面來說 充分體現(xiàn)了科學發(fā)展觀以人為本的要求 ，從小的方面說改善水環(huán)境，提高了人們的生活水平 。 （ 2）系統(tǒng)動態(tài)仿真調(diào)試及仿真運行 在動態(tài)并且負載情況下進行仿真調(diào)試的時候，需要 仔細觀察和記錄系統(tǒng)的仿真各種運行狀態(tài)，先模擬手動，再模擬自動，按照這種方法逐步進行。 調(diào)試過程 （ 1）系統(tǒng)靜態(tài)仿真調(diào)試 空載靜態(tài)仿真調(diào)試時，根據(jù)所運行的程序來檢查硬件部分連接是否正確，然后根據(jù)情況慢慢調(diào)試，首先對主程序進行調(diào)試，然后對初始化程序進行調(diào)試，最后再對主程序進行調(diào)試。它的功能是： IN1+IN2=OUT,具體格式見圖 53: 圖 53 加法指令格式 (3)接通延時定時器指令 TON 接通延時定時器是用于單一時間間隔的定時器。它的功能是：當使能輸入有效時，把一個單字節(jié)數(shù)據(jù)由 IN 傳送到 OUT所在的存儲單元。具體一個 SBR 池、 一個周期的流程圖如圖 51 所示。 /O 分配表 根據(jù)所需的控制要求與設(shè)計出的方案，列出 I/O 分配表，如表 41所示。 2SBR 池與 1SBR池間隔 2個小時，開始進水，每一個步驟與 1SBR 池相同，只是在時間上有所延長。 (6)潷水 1h結(jié)束后，至此，第一周期結(jié)束，開始下一循環(huán)周期進水，曝氣，回流。 (5)靜置 1h后，開始排水， 1池內(nèi) 1潷水器啟動，由上頂點緩慢向下移動， (可設(shè)為：下潛一小段距離后停住，潷水一定時間，再繼續(xù)下潛一小段距離，再停，再潷水，再下潛 )；潷水器潛至下頂點潷水結(jié)束后，迅速自動升回至上頂點停住。 (3)持續(xù)曝氣 6h后， 1風機停止曝氣。 污水處理控制流程 以 1SBR 池循環(huán)周期為例加以說明： (1)1SBR 池開始進水，進水 2h，通過 1電動蝶閥控制，進水的同時 1風機開始曝氣，污泥回流泵 1開啟，開始回流。它是實現(xiàn)自動檢測和自動控制的首要環(huán)節(jié)。系統(tǒng)所選用電動碟閥： D971，功率： 。 主要用途：控制各種工業(yè)自動控制生產(chǎn)的管道流量、壓力和溫度。結(jié)構(gòu)是由角行程電動執(zhí)行機構(gòu)和蝶閥整體機械連接，經(jīng)過安裝調(diào)試后共同組成。 （ 4）電動蝶閥 電動蝶閥它是電動閥門與電動調(diào)節(jié)閥中的一個品種 [12]。由 于 SBR 法工藝采 用間歇 式 反應(yīng)，進水、反應(yīng)、沉淀、 排水 這四個步驟 在同一 反應(yīng) 池內(nèi) 進行 ， 不需要經(jīng)過 二次沉淀池 與 污泥回流設(shè)備， 它的優(yōu)點是：占地 面積小 、 成本低 、出水水質(zhì)好 、高效率 ； 而且它 將多個 SBR 池連接起來， 不僅 具有傳統(tǒng)污泥法工藝的連續(xù)性（連續(xù)進水