现今有一种工程和家用的梯子叫“人字梯”有些是木头做的比较笨重有些是用铝合金制成搬运比较轻便也有足够的牢度如图所示梯子顶部连接处为光滑的
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![现今有一种工程和家用的梯子叫“人字梯”有些是木头做的比较笨重有些是用铝合金制成搬运比较轻便也有足够的牢度如图所示梯子顶部连接处为光滑的](/uploads/image/z/6094647-63-7.jpg?t=%E7%8E%B0%E4%BB%8A%26%2357348%3B%E6%9C%89%E4%B8%80%E7%A7%8D%E5%B7%A5%E7%A8%8B%E5%92%8C%E5%AE%B6%E7%94%A8%E7%9A%84%E6%A2%AF%E5%AD%90%E5%8F%AB%E2%80%9C%E4%BA%BA%E5%AD%97%E6%A2%AF%E2%80%9D%26%2357348%3B%E6%9C%89%E4%BA%9B%E6%98%AF%E6%9C%A8%E5%A4%B4%E5%81%9A%E7%9A%84%E6%AF%94%E8%BE%83%E7%AC%A8%E9%87%8D%26%2357348%3B%E6%9C%89%E4%BA%9B%E6%98%AF%E7%94%A8%E9%93%9D%E5%90%88%E9%87%91%E5%88%B6%E6%88%90%26%2357348%3B%E6%90%AC%E8%BF%90%E6%AF%94%E8%BE%83%E8%BD%BB%E4%BE%BF%E4%B9%9F%E6%9C%89%E8%B6%B3%E5%A4%9F%E7%9A%84%E7%89%A2%E5%BA%A6%26%2357348%3B%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%26%2357348%3B%E6%A2%AF%E5%AD%90%E9%A1%B6%E9%83%A8%E8%BF%9E%E6%8E%A5%E5%A4%84%E4%B8%BA%E5%85%89%E6%BB%91%E7%9A%84)
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