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The 18-meter-tall Rubber Duck arrived in Beijing on Friday. It was placed on waters in the International Garden Expo Park, where the Yongding River passes through. The Rubber Duck exhibition was designed by Dutch artist, Florentijn Hofman. It was part of the activities of Beijing Design Week, which ran from September 26 to October 3 in 2013. The Rubber Duck stayed in the park until September 23, then moved to the Summer Palace, a famous Beijing tourist spot, where it was on display until October 26. The duck is made of over 200 pieces of rubber. It was guarded not only by staff, but also by 10 volunteers wearing yellow T-shirts and hats with a rubber duck logo. Sun Yidong, a volunteer who guided visitors to the duck, said the art brought energy to the traditional Chinese park. “Seeing the giant Rubber Duck makes me feel like I’m a kid again.” Sun said. Because of the rain on Friday, there were not too many people coming to see it. The Expo workers said they expected more people to come and visit the duck on weekends. Zhao Yan said she had been following news about the duck since 2007, when the duck began its journey. “I even considered going to Hong Kong to see it. It’s great that the duck is in Beijing,” Zhao said. Before arriving in Beijing, the Rubber Duck traveled to 13 cities in nine countries. “The aim of the Rubber Duck is simply to bring everyone back to their childhood again,” said Zeng Hui, a leader of the Beijing Design Week Organizing Committee Office. “It can be a toy for adults.” 根据材料内容选择最佳答案,并将其标号填涂在答题卡的相应位置。 小题1:The Rubber Duck went to _______ after it left the International Garden Expo Park. A.the Olympic Park B.the Summer Palace C.Beihai Park D.Zhong Shan Park 小题2:The Rubber Duck arrived in Beijing on _______. A.Thursday B.Friday C.Saturday D.Sunday 小题3:Why weren’t there too many people going to see the Rubber Duck on Friday? A.They were not interested in it. B.They didn’t have enough time to go there. C.The weather was not good. D.The tickets were expensive. 小题4:Which of the following is NOT true? A.The Rubber Duck started its journey in 2007. B.Before arriving in Beijing the Rubber Duck was shown in 13 cities. C.The Rubber Duck is made of more than 200 pieces of rubber. D.A German artist designed The Rubber Duck. 小题5:What can we learn from the passage? A.The Rubber Duck can remind people of their childhood. B.Beijing Design Week finished on October 2. C.Sun Yidong was a visitor. D.Volunteers wore white T-shirts.
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【单选题】轴承在工作中超过正常温度的原因可能有:轴承与轴颈贴合不匀或接触面过小(配合间隙过小),造成单位面积上的比压过大;轴承有杂物或润滑油过多,或润滑油太脏,以及(),这时应该重新找正。
A.
设备转速变化
B.
轴承规格不对
C.
轴承材料选用不当
D.
压缩机安装时主轴与驱动机主轴联轴器找正不精确,或误差过大致使两轴偏斜或不同心
【简答题】由于排气温度限制,压缩机的排气温度是随该级压缩比的增加按一定的关系()的,过高的排气温度会恶化汽缸润滑油的性能。
【单选题】三相异步电动机的旋转方向与 有关。
A.
三相交流电源的频率大小
B.
三相异步电动机的连接方式
C.
三相电源的相序
D.
三相电源的电压大小
【简答题】与静电积聚程度有关的因素有:油品在管线中的() ,油品的灌装方式,管道的 (),大气温度与湿度,油的()量和()性,管道内壁粗糙程度,弯头、阀门及过滤网的多少,同等条件下,()质油料比润滑油类油料更易产生静电等。
【单选题】空压机的排气温度必须比润滑油闪点温度低20-40℃,因此,国内通常规定固定式压缩机排气温度不超过()℃。
A.
160
B.
180
C.
210
D.
240
【单选题】三相异步电动机的转动方向与下列()有关。
A.
电压大小
B.
电流大小
C.
电源相序
D.
频率大小
【单选题】三相异步电动机的旋转方向与 有关。
A.
三相交流电源的频率大小
B.
三相电源的相序
C.
三相电源的电压大小
【单选题】三相异步电动机的旋转方向与 有关。
A.
三相交流电源的频率大小
B.
三相异步电动机的负载特性。
C.
三相电源的相序。
D.
三相电源的电压大小。
【简答题】三相异步电动机的转动方向与()有关。
【单选题】空压机的排气温度必须比润滑油闪电温度低20~40℃,因此,国内通常规定固定式压缩机排气温度不超过()℃。
A.
160
B.
180
C.
210
D.
240
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