用0~25×0.01mm外千分尺测量工件,若衬筒刻度在6.5~7...
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立方氮化硼是一种超硬材料,其硬度略低于人造金刚石,但不能以正常的切削速度切削淬火等硬度较高的材料。...
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职业道德素质的提高,一方面靠他律,即();另一方面就取决于自我修养。A、社会的培养和组织的教育B、主观努力C、其他原因D、客观原因...
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Thursday, September 15, 2022
Thursday, September 15, 2022
实际尺寸相同的两副过盈配合件,表面粗糙度小的具有较大的实际过盈量...
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Thursday, September 15, 2022
数控机床不同螺距的丝杠与各种步距角的电机相配时,通过()设定,可...
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内应力的重新分布会引起已加工完零件的相应变形,使零件丧失原有的加...
Sunday, September 11, 2022
半精加工和精加工时,进给量的选择受到表面粗糙度的限制,可适当()...
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用同一平面上的三个支承点对工件的平面进行定位,能限制其()自由度...
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数控机床是应用了数控技术的机床,数控系统是它的控制指挥中心,是用...
Thursday, September 15, 2022