铣削矩形牙嵌离合器,产生底槽有明显凹凸痕迹的原因之一是()
A.分度头等分精度低
B.分度头主轴与进给方向不垂直或与工作台面不平行
C.分度不均匀
参考答案:B
A.It is in the heart of the city at 42nd Street and Fifth Avenue.
B.It is in the heart of the city at 42nd Street and Sixth Avenue.
C.It is in the heart of the city at 5nd Street and 42nd Avenue.
D.It is in the heart of the city at 6nd Street and 42nd Avenue.
事故发生后,事故现场有关人员应当立即向本单位负责人报告;单位负责人接到报告后,应当于()小时内向事故发生地县级以上人民政府安全生产监督管理部门和负有安全生产监督管理职责的有关部门报告。
A.1
B.2
C.3
D.4