[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f9QSXwy3AaF3wP-Am1hFJvxPEetxcT8lnHhHYto853pM":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":8,"question":12,"related":13,"source":17,"type":18},[],"2023-11-06 06:29:09",103507487,[],{"courseId":9,"courseImg":10,"courseName":11},"35675fcaf5ee1bad426789bbee4ab242","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc491bec2e253ec14fa70be83ad1f3e34.jpg","工程实训","3.27、计量器具的测量误差范围应与工件的 相适应,量程要适当,不应选择测量精度和范围 或 的计量器具",[14,19,24,29,34,39,44,49,54,59],{"answer":15,"createTime":5,"id":6,"options":16,"question":12,"source":17,"type":18},[],[],"v1",2,{"answer":20,"createTime":5,"id":21,"options":22,"question":23,"source":17,"type":18},[],103507491,[],"3.2、 和 统称为加工精度",{"answer":25,"createTime":5,"id":26,"options":27,"question":28,"source":17,"type":18},[],103507493,[],"3.11、根据规定的技术要求,将零件组合成组件或者部件,并进一步将零件、组件和部件组合成机器的过程叫做",{"answer":30,"createTime":5,"id":31,"options":32,"question":33,"source":17,"type":18},[],103507496,[],"3.15、检验时要轻轻塞入或卡入量规,只要通端可以通过,同时止端过不去,就表示零件 .通规过不去,或者止规过去了,都表明零件",{"answer":35,"createTime":5,"id":36,"options":37,"question":38,"source":17,"type":18},[],103507498,[],"3.4、表面粗糙度的评定参数很多,最常用的是 评定参数中的轮廓算术平均偏差Ra",{"answer":40,"createTime":5,"id":41,"options":42,"question":43,"source":17,"type":18},[],103507499,[],"3.20、计量器具是测量工具,绝对不可以作为其他工具来使用.下列行为均是 的:拿游标卡尺当划针使用进行划线操作;拿千分尺当榔头使用进行敲打工件;把钢直尺当起子使用旋螺钉;用钢直尺清理缝隙中的切屑;把计量器具如把千分尺等当玩具拿在手中任意挥动或摇转等",{"answer":45,"createTime":5,"id":46,"options":47,"question":48,"source":17,"type":18},[],103507501,[],"3.21、注意温度对测量结果的影响.一般的测量可以在室温下进行,但务必使工件与计量器具的温度 ,以免因为材料的热胀冷缩特性给测量结果带来误差;精密测量时一定要使计量器具和零件的温度都保持在 时进行;不准 用手拿精密的计量器具;不应将计量器具放在 或 上,更不能把精密的计量器具放在 (如火炉、电炉和热交换器等)附近,以避免由于计量器具受热变形使其失去精度",{"answer":50,"createTime":5,"id":51,"options":52,"question":53,"source":17,"type":18},[],103507503,[],"3.25、精密计量器具应实行 检定和保养,长期使用的精密计量器具,要 送计量检定机构进行保养和检定精度,以免因计量器具的示值误差超差而造成产品质量事故",{"answer":55,"createTime":5,"id":56,"options":57,"question":58,"source":17,"type":18},[],103507506,[],"3.19、计量器具在使用过程中,不要和工具、刀具堆放在一起,以免 量具.也不要随意放在机床上,以免因机床振动而使量具",{"answer":60,"createTime":5,"id":61,"options":62,"question":63,"source":17,"type":18},[],103507508,[],"3.6、为了将公差数值标准化,减少刀具和量具等的规格,同时又能满足各种机器所需的不同精度的要求,国家标准将反映尺寸精度的标准公差规定为 个等级,从IT01,IT0,IT1,IT2,…,IT18.其代号为 .其中 的精度最高, 的精度最低"]