问题
问答题 简答题
单级离心泵壳的作用是什么？
答案
参考答案：
泵壳作用是将自吸水管吸上来的水流引入叶轮，并将叶轮甩出的水汇集于蜗状压水室，水流在压水室内逐渐减速升压，不断进入出水管。此外泵壳还将支座、轴承架等固定部件连成一个牢固的整体。
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单级离心泵壳的作用是什么？
参考答案：
泵壳作用是将自吸水管吸上来的水流引入叶轮，并将叶轮甩出的水汇集于蜗状压水室，水流在压水室内逐渐减速升压，不断进入出水管。此外泵壳还将支座、轴承架等固定部件连成一个牢固的整体。
The 2010 Shanghai World Expo has been open for several months and there are large numbers of volunteers serving there. Chen Chuan，a 19- year-old student at Fudan University, is usually fast asleep at 6 am. But over the May 1 holiday, he was rising early to eat breakfast and 41 answer questions like，“Where can I find the toilet?” Such is the life of a Shanghai World Expo volunteer. But Chen and his 72,000 colleagues(同事)aren’t complaining, 42 ，they’re trying not to. “Volunteering is 43 work，”Chen said，“but it makes me feel happy. ” Other student volunteers have 44 feelings. Wang Lin an 18-year-old volunteer from Chongqing University，told us about trying to explain to a tourist why a line to visit a pavilion was so long. When the tourist suddenly got quite angry, Wang became upset 45 being shouted at. Wang said. “I didn’t expect we would have to face so many difficulties in our service. But I know serving is about giving 46 . ”Still，the very next day, Wang received a reward(嘉奖)when she helped a lost child 47 his parents. “The happy smiles and their gratitude(感谢)made me feel so 48 ，”Wang said. “That’s 49 I now always smile to others，even if they don’t look happy. Smiling makes me happy. ” 50 their green and white clothes，people call volunteers “Little Cabbage”. Wang likes this nickname(绰号). “We’re green, we are fresh，just like the vegetable，”Wang said.
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