问题
填空题
三视图中的三等关系是主附图（），主左图（）和俯左图（）。
答案
参考答案：长对正，高平齐，宽相等
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三视图中的三等关系是主附图（），主左图（）和俯左图（）。
参考答案：长对正，高平齐，宽相等
Lang Lang is a world-class young pianist who grew up in Shenyang. He went to a piano school in Beijing when he was just eight, "You need fortune(运气)，" his father said. "But you work hard, no fortune will come." What made him was that his piano teacher in Beijing didn't like him. "You have no talent(天赋).You will never be a pianist." As an eight-year-old boy, Lang Lang was badly . He decided that he didn't want to be a pianist any more. For the next two weeks, he didn't touch the piano. Wisely(明智的)his father didn't ,but wait. Luckily the day came when his teacher asked him to play some holiday songs. He didn't want to, but as he placed his fingers on the piano keys, he he could show other people that he had ability to do it well. That day he told his father that he wanted to with a new teacher. From that point on, everything turned around. He started competitions. In the 1994 International Young Pianists Competition when it was announced that Lang Lang had won, he was too to hold back his tears. Soon it was clear that he couldn't stay in China forever-he had to play on the world's big stages. In 1997 Lang Lang again, this time to Philadelphia, US. There he spent two years practicing and by 1999 he had worked hard enough for fortune to take over．After his performance at Chicago's Raviniu Festival, gigs（演奏会）in Lincoln Center and Camegie Hall started pouring in. Lang Lang finally worked to reach the place where fortune spots(找到)him, and lets him shine.
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