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【简答题】
Most people buy a lot of gifts just before Christmas. But some people think we buy too much. They have started a special day called Buy Nothing Day. They don’t want anyone to go shopping on that day. Buy Nothing Day is November 29. It’s 25 days before Christmas. It’s after Thanksgiving Day and often the first day of Christmas shopping. At this time, we see ads in Newspapers and on TV telling us to “buy, buy, buy!” The idea for Buy Nothing Day started in Vancouver, British Columbia. Now people all over the world celebrate Buy Nothing Day. In California, parents and children get together to read stories, sing songs, and paint pictures. The children talk about why they don’t need a lot of toys. This year, in Manchester, England, people dressed up in costumes(统一服装) to tell people that we buy too much. In Albuquerque, New Mexico, high school students wanted to tell other students about Buy Nothing Day. They organized a spaghetti dinner to give people information about Buy Nothing Day. They asked restaurants in the neighborhood to donate(捐赠) the food. They made posters and talked to other students about it. The dinner was a big success, and many students agreed not to buy anything on November 29. The students at high schools liked the idea of this new tradition. Next year, they want to have another dinner to tell more people about Buy Nothing Day! 小题1:Which of the following is NOT the day for people to celebrate Buy Nothing Day? A.November 29. B.25 days before Christmas. C.After Thanksgiving. D.The first day after Christmas. 小题2:People usually buy many gifts_______. A.before Thanksgiving B.on Christmas C.before Christmas D.anytime 小题3:How do people celebrate Buy Nothing Day? A.In California, parents and children get together to play games. B.In England, people celebrate by performing plays. C.In Mexico, high school students dress up. D.They buy nothing and persuade others not to buy things. 小题4:What did the students do in New Mexico for the day? A.They donated the food of their own. B.They talked to others about it. C.They made some slogans(标语口号) for it. D.They organized a luxurious(奢华的) dinner.
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【简答题】有一列管换热器,由38根 25×2.5mm的无缝钢管组成,苯在管内流动,由20℃被加热到80℃,苯的流量为8.32kg/s,求管壁对苯的对流传热系数。
【单选题】包豪斯发展的第二阶段被称为()
A.
慕尼黑时期
B.
柏林时期
C.
魏玛时期
D.
迪索时期
【简答题】列管式换热器外壳内径为625mm,内部由61根φ38mm×2.5mm的管子组成。试确定水在此换热器环隙内的流动状态。已知,水在管外的流量为180m 3 ·h -1 ,温度为30℃。若将水改在管内流动,其他条件不变,试判断此时水的流动类型。
【单选题】等质量的下列物质作阻冻剂,阻冻效果最好的是
A.
乙二醇( C 2 H 6 O 2 )
B.
乙醇( C 2 H 5 OH )
C.
丙二醇( C 3 H 8 O 2 )
D.
丙三醇( C 3 H 8 O 3 )
【简答题】包豪斯被称为( )
【判断题】包豪斯学校被称为现代设计摇篮。()
A.
正确
B.
错误
【简答题】若桥式整流电路中变压器次级电压为10V,则二极管的最高反向工作电压就不小于()V;若负载电流为800 ,则每只二极管的平均电流应大于()
【多选题】下列换热器中属于列管式换热器的有( )
A.
固定管板式换热器
B.
浮头式换热器
C.
U型管换热器
D.
翅片式换热器
E.
螺旋板式换热器
【简答题】若桥式整流电路中变压器次级电压为10V,则二极管的最高反向工作电压就不小于()V;若负载电流为800 mA ,则每只二极管的平均电流应大于()mA
【单选题】下列哪所学校被称为“新包豪斯”?
A.
伊利诺伊工学院
B.
包豪斯学院魏玛时期
C.
乌尔姆设计学院
D.
包豪斯学院柏林时期
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