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第1题

Most people usually traveled by ship and train which are driven by steam engine. It played an important part in many kin
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第2题

 调整法加工一批工件后的尺寸符合正态分布,且分散中心与公差带中心重合,但发现有相当数量的废品,产生的原因主要是( )(本题3.0分) A. 常值系统误差 B. 随机误差 C. 刀具磨损太大 D. 调态误差大
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第3题

Most people usually traveled by ship and train which are driven by steam engine. It played an important part in many kin
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第4题

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