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机械静联接又可以分为 联接和 联接,其中键联接、螺纹联接、销联接属于 连接。
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【单选题】AIDS is causing great public concern because the_____fatal disease hits primarily young people.
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invariably
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【简答题】A California Condor’s Shocking Recovery California condors are North America’s largest birds, with wind-length of up to 3 meters. In the 1980s, electrical lines and lead poisoning( 铅中毒 ) nearly drove ...
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