【正文】 量泵使用，又可作為變量泵使用。 (√ ) 6．液壓系統(tǒng)的工作壓力取決于泵的額定壓力。 2．解： (1)列出液壓缸的力平衡方程：》 1Al＝ P2A2+F P1 X100X10— 4＝ 0． 5X106X50X10— 4+30000， P1＝ 3． 25Mpa 溢流閥的調(diào)定壓力： Py＝ P1＝ 3． 25Mpa (5分 ) (2)泵的出口壓力由溢流閥調(diào)定 , (5分 ) 列出液壓缸的力平衡方程： 液壓氣動(dòng)技術(shù) 試題 2 一、填空題 (每空 2分，共， 20 分 ) 表 (相對 ) 絕對 2．液體粘度有三種表示方法 （ 動(dòng)力 ） ，粘度，運(yùn)動(dòng)粘度和 （恩氏） 粘 度 。 A． 節(jié)流調(diào)速 B．容積調(diào)速 C．容積節(jié)流調(diào)速 4．濕空氣的絕對濕度是指 ( D )。 A．隨流量變化 B．隨轉(zhuǎn)速變化 C. 決定于結(jié)構(gòu)尺寸 5．單桿活塞缸采用差動(dòng)連接方式時(shí)，具有效工作面積為 ( C )。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。液壓泵壓力穩(wěn)定在溢流閥的調(diào)定壓力，即： Visafree policy brings Chengdu biz, tourism boost. Making national headlines several times, Chengdu39。 ( 一 ) 二、選擇題 (每題 2分，共 20分 ) 1．我國采用 40℃時(shí)液壓油的 ( B )值為具