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Tracy Caulkins is known as the first American to set an American record and win an American title in each of four swimming strokes(): breaststroke, butterfly, backstroke, freestyle. Tracy Caulkins was born in Minnesota and lived in Iowa until she was six. She began swimming when she was eight, after the family had moved to Nashville, Tennessee. While unwilling at first to swim in cold water or get her face wet, she began to train in earnest (认真地) as her talent became clear. Though her father worked for the public schools, the family sent her to a private school when the public schools could not accommodate (适应) her training schedule. At age 13, Tracy Caulkins took part in the trials(选拔赛) for the 1976 Olympics, but did not make the team. She continued to win national and international titles, and was disappointed in 1980 when the U.S. didn’t attend the Moscow Olympics. She continued to train and compete. In 1981, Tracy Caulkins began college, graduating in 1985. In college, she continued competing and training, though she had slowed down from her peak (顶峰) years. Caulkins trained especially hard for the 1984 Olympics, and not only made the team, but was captain of the swim team and at Los Angeles, won three gold medals and was named Sportswoman of the Year by the U.S. Olympic Committee. After that she retired from swimming, and was a commentator (解说员) for swimming events as well as taking advantage of her fame to do business. Tracy Caulkins married Australian swimmer, Mark Stockwell, in 1991, their romance having begun at the 1984 Olympics when he jumped into a warm-up pool to introduce himself. They married in Nashville and moved to Australia, where they had three children. Caulkins continued to be professionally involved in sports. 小题1:Tracy Caulkins was sent to a private school because _____. A.the schedule of the public school wasn’t suitable for her B.her parents had to work in the school C.her family had moved to Nashville, Tennessee D.she showed strong interest in swimming 小题2:Which Olympic Games did Tracy Caulkins attend? A.The 1976 Olympic Games. B.The 1980 Olympic Games. C.The 1984 Olympic Games. D.The 1992 Olympic Games. 小题3:Give the correct order of the following events in Tracy Caulkins’ life. a. She was named Sportswoman of the Year. b. She became a commentator. c. She got married. d. She went to college. e. She attended the Olympics. A.d; e; a; b; c B.d; e; c; b; a C.d; a; e; c; b D.d; e; a; c; b 小题4:When was Tracy Caulkins born? A.In 1963 B.In 1953 C.In 1960 D.Not mentioned
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【单选题】在由118根φ25mm×2.5mm,长为3m的钢管组成的列管式换热器中,用饱和水蒸气加热空气,空气走管程。已知加热蒸汽的温度为132.9°C,空气的质量流量为7200kg/h,空气的进、出口温度分别为20°C和60°C,操作条件下的空气比热容为1.005kJ/(kg ・ °C), 空气的对流给热系数为50W/(m 2 °C),蒸汽冷凝给热系数为8000W/(m 2 ·°C),假设管壁热阻、垢层热阻...
A.
B.
不能
C.
无法确定
【单选题】组成栅格数据最基本的单元是( )
A.
B.
C.
D.
像元
【单选题】产品结构,努力实现由旅游供给不足向供需基本平衡转变,是优化()
A.
旅游供给体系
B.
旅游发展模式
C.
旅游市场体系
D.
旅游创新体系
【简答题】在列管式换热器中,用饱和蒸气加热空气,此时传热管的壁温接近____ ____流体的温度;总 传热系数 K 接近 ____ ____ 流体的对流 给 热系数。
【简答题】在一单管程列管式换热器中,将 2000kg/h 的空气从 20 °C加热到 80 °C,空气在钢质列管内作湍流流动,管外用饱和水蒸汽加热。列管总数为 200 根,长度为 6m ,管子规格为 φ 38 × 3mm 。现因生产要求需要设计一台新换热器,其空气处理量保持不变,但管数改为 400 根,管子规格改为 φ 19 × 1.5mm ,操作条件不变,试求此新换热器的管子长度为多少米?
【单选题】组成栅格数据最基本的单元是
A.
B.
C.
像元
D.
【简答题】在列管式换热器中 , 用饱和蒸气加热空气 , 此时传热管的壁温接近 ________ 流体的温度 , 总传热系数 K 接近 ______ 流体的对流给热系数 .
【判断题】组成栅格数据最基本的单元是列。
A.
正确
B.
错误
【单选题】组成栅格数据最基本的单元是( )。
A.
B.
像元
C.
D.
【单选题】组成栅格数据最基本的单元是()
A.
B.
象元
C.
D.
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