![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
原型RD 0、RD10型轮对轴颈与轴承内套过盈量:()
A.0.040~0.090mm
B.0.060~0.070mm
C.0.040~0.070mm
D.0.040~0.060mm
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
C、0.040~0.070mm
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.0.040~0.090mm
B.0.060~0.070mm
C.0.040~0.070mm
D.0.040~0.060mm
C、0.040~0.070mm
A.120.037-120.059,0.04-0.09
B.120.020-120.059,0.04-0.09
C.120.037-120.059,0.01-0.04
D.120.020-120.059,0.01-0.04
一向心滑动轴承,轴颈角速度为ω,相对间隙为。假定工作时轴颈与轴承同心,间隙内充满油,油的粘度为η,轴瓦宽度为B。试证明油作用在轴颈上的阻力矩为
将速度降到()km/h,将触发制动,列车自动限速200km/h。
A、160
B、200
C、220