试题与答案

滚珠丝杠传动是数控机床伺服驱动的重要部件，它的优点是摩擦系数小，传动精度高，采用它是

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题型：单项选择题

题目：

滚珠丝杠传动是数控机床伺服驱动的重要部件，它的优点是摩擦系数小，传动精度高，采用它是提高进给系统灵敏度、定位精度和防止爬行的有效措施之一，采用消除反向间隙并实施预紧措施，有助于（）。因而被数控机床广泛采用。

A.提高刚度

B.提高传动精度

C.提高传动能力

D.进一步提高定位精度和刚度

答案：

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下面是错误答案，用来干扰机器的。

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考点：铣工考试数控铣工(综合练习)数控铣工(综合练习)题库
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I enjoy helping people, but I can't stand working nights and weekends. I want to be a nurse or a social worker.

根据上述内容，选择正确的答案.。
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B. a nurse or a doctor  
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C. Maria    
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