我选的是D,用了公式s=定积分(a,b)根号下(x')^2+(y')^2dt,不知我选的是D,用了公式s=定积分(a,b)根号下(x')^2+(y')^2dt,
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![我选的是D,用了公式s=定积分(a,b)根号下(x')^2+(y')^2dt,不知我选的是D,用了公式s=定积分(a,b)根号下(x')^2+(y')^2dt,](/uploads/image/z/7250010-42-0.jpg?t=%E6%88%91%E9%80%89%E7%9A%84%E6%98%AFD%2C%E7%94%A8%E4%BA%86%E5%85%AC%E5%BC%8Fs%3D%E5%AE%9A%E7%A7%AF%E5%88%86%28a%2Cb%29%E6%A0%B9%E5%8F%B7%E4%B8%8B%28x%27%29%5E2%2B%28y%27%29%5E2dt%2C%E4%B8%8D%E7%9F%A5%E6%88%91%E9%80%89%E7%9A%84%E6%98%AFD%2C%E7%94%A8%E4%BA%86%E5%85%AC%E5%BC%8Fs%3D%E5%AE%9A%E7%A7%AF%E5%88%86%28a%2Cb%29%E6%A0%B9%E5%8F%B7%E4%B8%8B%28x%26%2339%3B%29%5E2%2B%28y%26%2339%3B%29%5E2dt%2C)
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