【单选题】【消耗次数：1】
粗加工阶段的主要任务是（）。
①
达到粗糙度要求
②
切除大部分余量
③
达到形状误差要求
④
达到尺寸精度要求
参考答案：
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相关题目
【多选题】
下面关于表面粗糙度要求的确定方法，叙述正确的是
①
根据尺寸精度等级确定粗糙度的要求
②
根据加工方法确定粗糙度的要求
③
根据表面的功能确定粗糙度的要求
④
参考类似零件确定粗糙度的要求
【单选题】
当有色金属（如铜、铝等）的轴类零件外圆表面要求尺寸精度较高、表面粗糙度值较低时，一般只能采用的加工方案为（）
①
粗车－精车－磨削
②
粗铣－精铣
③
粗车－精车—超精车
④
粗磨—精磨
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The boy and his mother were ____ in the burning house.
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involved
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trapped
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surrounded
【单选题】
____ of whether you are ill or not, I want you to cover the story of today’s conference on the environment.
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Regardless
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Despite
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Even
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amazing
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attempting
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awaking
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amusing
【单选题】
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how
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Which
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will
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be
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should
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【单选题】
29. As they cant afford to let the situation get worse, they will take some necessary ____.
①
decisions
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sides
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【单选题】
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①
It’s OK with me
②
It doesnt matter
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Don’t be sorry
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【单选题】
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①
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____ the water sports — sailing, rowing, diving and swimming, I like rowing best. ?
①
At all ?
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Above all ?
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In ____ recent years, Niagara Fallshave come to be appreciated more for their natural beauty as _______ wonder of nature.
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the; a
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/; the
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/; a