【单选题】【消耗次数：1】
零件的机械加工精度主要包括（ ）。
①
机床精度、几何形状精度、相对位置精度
②
尺寸精度、几何形状精度、装夹精度
③
尺寸精度、定位精度、相对位置精度
④
尺寸精度、几何形状精度、相对位置精度
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【单选题】
齿轮的传动精度、平稳精度和接触精度（）
①
A．必须选择同一精度等级
②
B.可选择不同精度等级
③
C.必须传递运动准确性精度等级最高
④
D.必须传动平稳性精度等级最高
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David, there-------a dictionary and some books on your desk. Please put them away.
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is
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are
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have
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has
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studies
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studied
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study
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will study
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joined
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exposed
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affected
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related
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set out
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put up
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call for
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and
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or
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but
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By now
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As usual
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So far
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I have no idea
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No, no. I can carry it myself
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That’s a good idea
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under
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by
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They talked in whispers, but still, I couldn’t help but __________ their conversation.
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overhear
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to overhear
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overhearing
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overheard