【简答题】某减速器中有一直齿圆柱齿轮,精度等级为8-7-7,模数m=4mm,齿数z=50,齿宽b=50mm,齿形角α=20°。与另一齿轮组成的齿轮副,其中心距a=250mm,法向侧隙j n =0.084~0.321mm。小批量生产,试确定齿轮的检验组并查出相应的公差值,并计算齿厚偏差和公法线平均长度极限偏差。
【单选题】Assume i and j are member variables with double type in class X. In the following codes, which one is NOT RIGHT constructor? ( )
A.
double X(double k ){ i=k; return i; }
B.
X(double m, double n ){ i=m; j=n; }
【单选题】Which one is not N.J.Zivkovic's composition?
【单选题】一对啮合在一起的齿轮,模数m=4,大齿轮齿数 Z 1 =38 ,小齿轮齿数 Z 2 = 17,两齿轮的齿根与齿顶的间隙:
【简答题】一对直齿圆柱齿轮,模数m=3mm,齿数z 1 =21,z 2 =66,压力角α=20 0 ,正常齿制。计算齿轮的主要几何尺寸填入相应括号内。 (1)小齿轮的 分度圆直径d 1 =( )mm ; (2)小齿轮的齿顶圆直径d a1 = ( )mm mm; (3)小齿轮的齿根圆直径d f1 = ( )mm; (4) 齿距p= ( )mm ; (5)中心距a= ( )mm。
【单选题】Which one is not the main representative figure of postmodernism ?
【单选题】能用紫外线光擦除ROM中的程序的只读存储器为()