電大液壓氣動技術期末復習試題1、2、3及詳細答案小抄參考-免費閱讀
【正文】 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 2021. 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 w idely 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 w ill travel through the belt in China and in Kazakhstan, Uzbekistan and Turkey. They will 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。 (D活塞 B動， A不動。 A．節(jié)流閥與順序閥并聯 B．節(jié)流閥與 J頃序閥串聯 C．節(jié)流閥與差壓式減壓閥并聯 D. 節(jié)流閥與差壓式減壓閥串聯 7．以變量泵為油源時，在泵的出 U并聯溢流閥是為了使閥起到 ( A )。 ( 十 ) 9．等溫過程中氣體的內能保持不變，是由于氣體與外界無熱量交換。 A．氣體的內能保持不變 B．氣體的壓力保持不變 D．氣體與外界無熱量交換 液壓氣動技術 試題 3 一、判斷題 (每題 2分，共 20分 ) (判斷下列所述是否正確，正確填人“ +”，錯誤則填“一” ) 1．液體的體積模量越大，表明該液體抵抗壓縮的能力越強。 ( √ ) 8．要使氣體流動速度達到超音速流動，管道截面形狀必須先收縮后擴張。 4．按結構形式分，常用的液壓泵有 （ 齒輪泵 ） 、 （葉片泵 ） 和柱塞泵三類 . 5．氣源裝置中， （ 后冷卻器 ） 安裝在空氣壓縮機的出口處，而干燥器應安裝在 （ 儲氣罐 ） 的出口處。 A. 過載保護作用 B．控制油缸運動速度 C．令油缸穩(wěn)定運動的作用 D．控制油路通斷的作用 5．等容過程的特征是 ( C )。 (√ ) 8．將馬赫數 M1的氣體流動，稱為超音速流動。 5．為保證氣動系統(tǒng)正 常工作，需要在壓縮機出口處安裝 （后冷卻器） 以析出水蒸 氣，并在儲氣罐出口安裝 （干燥器） ，進一步消除空氣中的水分。 二、判斷題 (正確的打√，錯誤的打 X，每題 2分，共 20分 ) 1．重力作用下的靜止液體的等壓面是水平面。 ( X ) 9．每 lm3濕空氣中，含有水蒸氣的質量稱為濕空氣的絕對濕度。 A. 氣體的內
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