【单选题】【消耗次数：1】
立式加工中心是指（ ）的加工中心。
①
主轴为水平
②
主轴为虚轴
③
主轴为垂直
④
工作台为水平
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在主轴箱体的加工中，以主轴毛坯孔作为粗基准，目的是（）。
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在主轴箱体的加工中，以主轴毛坯孔作为粗基准，目的是( )。
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