题目内容
在基孔制的间隙配合或基轴间隙配合中，孔的公差带一定在零线以上，轴的公差带一定在零线以下
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在间隙配合中，可能出现零间隙的状态。此时孔的实际尺寸等于轴的实际尺寸，而在过渡配合中，绝不可能出现零间隙的状态。
某一零件的实际尺寸正好等于其基本尺寸，则这尺寸肯定合格
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