【单选题】【消耗次数：1】
电动机主轴的优点：主轴部件结构更紧凑，重量大，惯量小，可提高启动、停止的响应特性。该说法（ ）
①
正确
②
错误
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【判断题】
主轴高速化的手段是采用内装式主轴电动机，使主轴驱动不必通过变速箱，而是直接把电动机与主轴连接成一体后装入主轴部件，从而可将主轴转速大大提高。该说法（ ）
①
正确
②
错误
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must give ?
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