20xx年最新電大機(jī)電控制與可編程序控制器技術(shù)課程形成性考核冊(cè)作業(yè)一、二、三、四資料匯總-資料下載頁(yè)
2024-11-05 11:38本頁(yè)面
【導(dǎo)讀】1．可編程序控制器通過(guò)____________、____________的輸入和輸出，控制各類(lèi)型的機(jī)械或生產(chǎn)過(guò)程。2．熔斷器主要防止電路的____________或____________。3．電磁式接觸器主要由____________、____________和滅弧裝置和其它部分組成。5．.熱繼電器是利用電流流過(guò)發(fā)熱元件產(chǎn)生熱量來(lái)使檢測(cè)元件____________，進(jìn)而推動(dòng)機(jī)構(gòu)動(dòng)作的一種保。護(hù)電器，主要被用作電動(dòng)機(jī)的長(zhǎng)期保護(hù)。2．PLC是專(zhuān)門(mén)用來(lái)完成邏輯運(yùn)算的控制器。3．PLC具有監(jiān)控和自診斷能力，若發(fā)生故障或異常，可及時(shí)判斷故障原因，并排除故障。4．由于PLC的可靠性和抗干擾能力較差，所以不能在惡劣的工業(yè)環(huán)境中應(yīng)用。5．在工業(yè)自動(dòng)化領(lǐng)域，PLC，DCS與IPC技術(shù)正在趨于融合。6．開(kāi)啟式負(fù)荷開(kāi)關(guān)可用于手動(dòng)頻繁的接通和斷開(kāi)帶負(fù)荷的電路，以及作為線(xiàn)路末端的短路保護(hù)。7．為防止無(wú)關(guān)人員誤操作，在重要場(chǎng)合應(yīng)選用帶鑰匙操作的按鈕。10．低壓斷路器即低壓自動(dòng)空氣開(kāi)關(guān)，簡(jiǎn)稱(chēng)自動(dòng)開(kāi)關(guān)，可實(shí)現(xiàn)電路的短路、過(guò)載、失電壓與欠電壓的保護(hù)，20．電氣原理圖中電器元件均處于自然狀態(tài)。
【正文】 remains of the Jin sha civilization that dates back more than 3,000 years as well as the Qing cheng Mountains and the Du jiang yan irrigation system. Qing cheng has long been recognized as the birthplace of Taoism, China39。s ancient indigenous religion, while Du jiang yan is considered to be the oldest functioning watercontrol project in the world. Chengdu ranked third in tourist facilities, management and services among 60 Chinese cities in a customer satisfaction survey released last year. But, Li added that efforts are still needed to develop more tourism products, improve English services and provide accurate translation of traffic signs and scenic billboards. Zhao Yun, chairwoman of British Chamber of Commerce Southwest China, told China Daily that his colleagues found the policy very convenient. A British client once flew here and stayed for just one day to check her ordered goods, she said. Zhao was born in Shanxi province, but she has lived in Chengdu for more than 10 years. My life was like a running race moving from place to place. I also lived in Beijing and Shanghai before, she said. But Chengdu is a place that you never want to leave once settling down. It is now my second hometown, she said. If the environment is further improved, the city will attract more people to visit and live, with the 72hour visafree policy and pelling conditions in transportation, culture, climate and cuisine, he said. Foreigners also gave positive feedback on the policy. A spokesman from Dell Inc said the pany has a global hub of operation in Chengdu, so the threeday visa has an immediate and positive influence on the pany39。s business development. Rudy Buttignol, president of the public broadcasting pany in British Columbia, Canada, said his work requires frequent travel to Chengdu and the policy makes the trips easier. Data from the city39。s public security bureau shows some 100 foreign visitors enjoyed the 72hour policy by the end of March, most of them from the United States, the United Kingdom and Germany. Chengdu also reported robust growth in its overall tourist industry last year. Official statistics show that it received some 150 million tourists last year, an increase of 28 percent from 2020. Around million came from abroad, an increase of 12 percent. Total revenue from tourism surpassed 133 billion yuan ($). During his visit to Kazakhstan in September, Chinese President Xi Jinping proposed that China and Central Asia join hands to build a Silk Road economic belt to boost cooperation. The idea has been widely echoed in Central Asian countries, being an encouraging blueprint for Chinese areas along the Silk Road that has linked Asia and Europe for more than 2,000 years. In the next three weeks, China Daily reporters will travel through the belt in China and in Kazakhstan, Uzbekistan and Turkey. They w ill show the progress and expectations of the countries, businesses and peoples on the route. Shaanxi the start of the ancient Silk Road has positioned itself as the new starting point for the development of the Silk Road Economic Belt, w hich will strengthen China39。s cooperation w ith Central Asian countries, a senior official said. Shaanxi Governor Lou Qinjian said the province is fresh, rich and unique, as it was when it anchored one end of the ancient Silk Road. It is the best option for acmodating industrial transfers from East China or the w orld at large, he said on Wednesday in Xi39。an. Lou held a joint interview with 27 media, including China Daily, the first in a series of interviews entitled Chinese Media Along the Silk Road. The interview s will be in Shaanxi and Gansu provinces and the Xinjiang Uygur autonomous region, as well as Kazakhstan, Uzbekistan and Turkey. The media group held the first interview on Wednesday morning in Xi39。an, the starting point of the ancient Silk Road, a trade channel established more than 2,000 years ago linking China, Central Asia and Europe.
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