佝偻病的发生是由于缺乏（　　　）．

【单选题】【消耗次数：1】

佝偻病的发生是由于缺乏（　　　）．

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【单选题】 mso-ascii-theme-font:minor-latin;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Times New Roman mso-bidi-theme-font:minor-bidi;mso-ansi-language:EN-US;mso-fareast-language: ZH-CN;mso-bidi-language:AR-SA;mso-bidi-font-weight:bold">重合断面图应画在

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① 尺寸分析

② 线型分析

③ 视图选择

④ 形体分析

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① 间距可不一致

② 无要求

③ 必须方向一致

④ 方向必须一致并要间隔相同

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① 投射方向

② 名称

③ 投射方向和相应字母

④ 不标注

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① 所有螺纹只需标出相应标准所规定的螺纹代号

② 所有螺纹的公称直径前面必须加上“M”符号

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① 正确

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② HCl——NaCl

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随机题目

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① S

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【单选题】在正等测中，轴向简化伸缩系数为（　　）

① 0.5

② 0.82

③ 1

④ 1.22

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【单选题】螺栓的规格为M12×60，其中60的含义是（　　）

① 螺杆的长度

② 螺栓的总长

③ 螺纹的长度

④ 螺距的长度

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【单选题】 φ50f7表示（　　）

① 直径为50的孔，公差带代号为f7

② 直径为50的轴，公差带代号为f7

③ 直径为50的孔，公差为f7

④ 直径为50的轴，公差等级为f7

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【单选题】从图上量得的尺寸值是60mm，而该图上标注的尺寸是30mm，则该图的比例是（　　）

① 1:2

② 3:6

③ 1:1

④ 2:1

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【单选题】表示（　　）

① 直径为60的孔，公差带代号为F7

② 直径为60的轴，公差带代号为F7

③ 直径为60的孔，公差为F7

④ 直径为60的轴，公差等级为F7

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【单选题】标注圆的直径时，在尺寸数字的前面应加注（　　）

① S

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【单选题】画正等轴测图的投影方法是（　　）

① 中心投影法

② 多面正投影法

③ 单面正投影法

④ 单面斜投影法

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【单选题】粗糙度符号表示（　　）

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② 用去除材料的方法获得的表面粗糙度，Ra的值为25m

③ 用不去除材料的方法获得的表面粗糙度，Ra的值为25m

④ 用不去除材料的方法获得的表面粗糙度，Ra的最大值为25m

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【单选题】位置公差符号表示被测要素相对于基准B的（　　）

① 直线度公差为0.2mm

② 平面度公差为0.2m

③ 平面度公差为0.2mm

④ 平行度公差为0.2mm

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