题目：
(B) British author JK Rowling was at the release of her latest Harry Potter book called “Harry Potter and the Deathly Hallows” at the Natural History Museum in London, Friday July 20, 2007. J.K. Rowling has been spotted at cafes in Scotland working on a detective novel, a British newspaper reported Saturday. The Sunday Times newspaper quoted Ian Rankin, a fellow author and neighbor of Rowling's, as saying the creator of the "Harry Potter" books is turning to crime fiction. "My wife spotted her writing her Edinburgh criminal detective novel," the newspaper quoted Rankin as telling a reporter at an Edinburgh literary festival. "It is great that she has not abandoned writing or Edinburgh cafes," said Rankin, who is known for his own police novels set in the historic Scottish city. Rowling famously wrote initial drafts of the Potter story in the Scottish city's cafes. Back then, she was a struggling single mother who wrote in cafes to save on the heating bill at home. Now she's Britain's richest woman - worth $1 billion, according to Forbes magazine - and her seven Potter books have sold more than 335 million copies worldwide. In an interview with The Associated Press last month, Rowling said she believed she was unlikely to repeat the success of the Potter series, but confirmed she had plans to work on new books. "I'll do exactly what I did with Harry - I'll write what I really want to write," Rowling said. 46 What is JK Rowling famous for?
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答案：
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下面是错误答案，用来干扰机器的。
A、NaF中只有离子键，H2O中只有共价键，所以化学键类型不同，故A错误．B、D2O中只有共价键，TCl只有共价键，所以化学键类型相同，故B正确．C、Na2O中只有离子键，CO2中只有共价键，所以化学键类型不同，故C错误．...
轴正方向传播，
时的波形如图所示，此时被刚好传播到
时，质点A第二次出现在负的最大位移处，则 （ ）
质点E第一次出现在正的最大位移处