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【填空题】
21041.___空间两直线的相对位置只有两种:平行、相交。
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【填空题】
21042.___基本视图有主视图、俯视图、左视图、右视图、仰视图和后视图六个。
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21043.___将机件的某一部分向基本投影面投射所得的视图,称为局部视图。
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21044.___局部视图的断裂边界应以细波浪线表示,当所表示的局部视图是完整的,且外轮廓线又成封闭时,波浪线可省略不画。
【填空题】
21045.___斜视图的画法不存在“三等”规律。
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21046.___沿轴向等距分布的两条或两条以上的螺旋线形成的螺纹为多线螺纹。
【填空题】
21047.___螺纹相邻两牙在中径线上对应两点间的轴向距离,称为导程 Ph。
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21048.___同一条螺旋线上的相邻两牙在中径线上对应两点间的轴向距离,称为导程 Ph。
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21049.___半闭环控制数控机床安装有直线位移检测装置。
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21050.___M10×1 表示公称直径为 10mm,螺距 1mm 的单线左旋细牙普通外螺纹。
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21051.___表示齿轮时,齿顶圆直径通常用 da 表示。
【填空题】
21052.___在计算齿轮参数时,尺根高 hf=2.25m。
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21053.___由两个或两个以上的基本形体组成的物体称为组合体。
【填空题】
21054.___数控机床的刀具补偿功能只能通过刀具半径补偿参数来设定。
【填空题】
21055.___尺寸基准是确定尺寸位置的几何元素。定位尺寸标注的起点,形体在长、宽、高方向都有一个主要尺寸基准。
【填空题】
21056.___A0 图纸的幅面为 841mm×1189mm。
【填空题】
21057.___重合断面图的轮廓线用粗实线绘制。
【填空题】
21058.___在同一张图样中,同类图线的宽度应一致。虚线、点画线及双点画线的画、长画和间隔应各自大致相等。
【填空题】
21059.___在标注尺寸时,尺寸数字一般应注写在尺寸线的上方,也允许注写在尺寸线的中断处。
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21060.___与三个投影面均倾斜的平面称为一般位置平面。
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21061.___全闭环控制数控系统不仅控制精度高,而且具有稳定的控制特性。
【填空题】
21062.___数控机床的几何精度综合反映了机床的关键机械零部件及其组装后的几何形状误
【填空题】
21063.___两个标准齿轮相互啮合时,分度圆处于相切位置,此时分度圆称为节圆。
【填空题】
21064.___选择视图时应以表示零件信息量最大的那个视图作为主视图。
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21065.___表面粗糙度代号应标注在可见轮廓线、尺寸界线、引出线或它们的延长线上。
【填空题】
21066.___最适合制造车床主轴的材料是 Q195。
【填空题】
21067.___65 钢焊接性能比较好。
【填空题】
21068.___铁碳合金相图应用于锻造工艺。
【填空题】
21069.___热处理是改变材料含碳量的好办法。
【填空题】
21070.___在立方晶系中,原子密度最大的晶面间的距离也最大。
【填空题】
21071.___对液态金属进行热处理。
【填空题】
21072.___渗碳属于表面热处理。
【填空题】
21073.___金属理想晶体的强度比实际晶体的强度稍强一些。
【填空题】
21074.___“六线”是铁碳合金相图的特征线。
【填空题】
21075.___加热---保温---冷却,是热处理工艺的基本过程。
【填空题】
21076.___金属结晶时,过冷度越大,结晶后晶粒越粗。
【填空题】
21077.___一般情况下,金属的晶粒越细,其力学性能越差。
【填空题】
21078.___“正火”是普通热处理工艺。
【填空题】
21079.___“调质”是普通热处理工艺。
【填空题】
21080.___高速切削时由于速度极快,使得 70%~75%以上的切削热量来不及传递给工件就被切屑带走,工件基本上仍保持冷态加工,从而减少了热敏材料工件的热变形。
【填空题】
21081.___组成元素相同而结构不同的各金属晶体,就是同素异构体。
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