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已知流速场ux=ax，uy=-ay，uz=0，则流函数()。
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一管壳式蒸汽—空气加热器，空气在管内，要求将空气由15℃加热到50℃，空气体积流量为υ0=5m3/s。蒸汽为2×105Pa绝对压强的干饱和水蒸气，凝结水为饱和水，已知传热系数k=75W/(m2.k)，则加热器所需面积为()。
Calling to a bully's parent____.
Not long after the telephone was invented. I assume, a call was placed. The caller was a parent saying，“Your child is bullying my child, and I want it stopped!”The bully's parent replied，“You must have the wrong number. My child is a 1ittle angel. ”
A trillion phone calls later. The conversation is the same. When children are teased or tyrannized(欺压)，the parental impulse is to grab the phone and rant. But these days，as studies in the US show bullying on the rise and parental supervision on the decline，researchers who study bullying say that calling morns and dads is more futile than ever. Such calls often lead to playground recriminations(指责)and don't really teach our kids any lessons about how to navigate the world and resolve conflicts.
“When you call parents, you want them to‘extract the cruelty’from their bullying children. ”says Laura Kavesh，a child psychologist in Evanston，Illinois. “But many parents are blown away by the idea of their child being cruel. They won't believe it. ”In a recent police-department survey in Oak Harbor. Washington. 89 percent of local high school students said they had engaged in bullying behavior. Yet only 18 percent of parents thought their children would act as bullies.
In a new US PIA survey, 5 percent of parents support contacting other parents to deal with bullying. But many educators warn that those conversations can be misinterpreted(误解), causing tempers to flare. Instead, they say，parents should get objective outsiders，like principals，to mediate.
Meanwhile, if you get a call from a parent who is angry about your child's bullying, listen without getting defensive. That's what Laura McHugh of Castro Valley, California, did when a caller told her that her then 13-year-old son had spit in another boy's food. Her son had confessed，but the victim's mom“wanted to make sure my son hadn't given her son a nasty disease，”says McHugh，who apologized and promised to get her son tested for AIDS and other diseases. She knew the chance of contracting any disease this way was remote，but her promise calmed the mother and showed McHugh's son that his bad behavior. was being taken seriously. McHugh，founder of Parents Coach Kids，a group that teaches parenting skills，sent the mom the test results. All were negative.
Remember：once you make a call, you might not like what you hear. If you have an itchy dialing finger, resist temptation. Put it in your pocket.
The word“bullying”(Line 2，Para. 1)probably means____.
Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听力原文：The most influential people and websites in China's booming Internet industry have been chosen by an online voting contest and industry experts. The top 10 people and best 100 websites in 10 categories were announced on Saturday. (27)The Sina company, an Internet Content Provider in China, won the top prize in the category of providing integrated online services, which is recognized as the most important prize in the contest. CWW, Sohu and Netease ranked second to fourth on the list.
The website of China Daily, www. Chinadaily.com.cn, was among the top 10 in the media website category. (28)People's Daily came top in the category. The selection, organized by the second China Internet Contest, attracted more than 100000 online voters.
Bosses of China's leading ICP firms, Ding Lei from Netease, Wang Zhidong from Sina and Zhang Chaoyang from Sohu, were voted onto the top 10 list. Internet celebrities Tian Suning, Liu Yunjie, Wu Jianping, Qian Hualin and Zhang Shuxin--the only woman placed--were also ill the top 10. (26)Jiang Kun, a prominent Chinese comic dialogue actor, was voted in for his work on Internet development. He set up China's first online comic dialogue website and actively joined in Internet promotions. Qian Tianbai, regarded as the father of Internet in China, is also included in the top 10. He registered the ".cn" for China in 1990 and sent the first e-mail in 1987. Sadly, he died last year.
(27)
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