A、1.4<sub>n1sub><n<0.7<sub>n2sub> B、1.3<sub>n1sub>= n =0.6<sub>n2sub> C、1.3<sub>n1sub>>n>0.6<sub>n2sub> D、1.4<sub>n1sub>>n =0.7<sub>n2sub>
A、1.4<sub>n1sub><n<0.7<sub>n2sub> B、1.3<sub>n1sub>= n =0.6<sub>n2sub> C、1.3<sub>n1sub>>n>0.6<sub>n2sub> D、1.4<sub>n1sub>>n =0.7<sub>n2sub>
A、n<sub>1sub>=n<sub>2sub> B、n<sub>1sub>>n<sub>2sub> C、n<sub>1sub><n<sub>2sub> D、无法确定
A、下图所示轮系中:z<sub>1sub>=2,z<sub>2sub>=60,z<sub>3sub>=25,z<sub>4sub>=50,z<sub>5sub>=20,z<sub>6sub>=30,又知蜗杆的转速n<sub>1sub>=900rmin,方向如图所示。求若轴B转速n<sub>Bsub>=0,那么轮6的转速n<sub>6sub>?转向如何?以及若n<sub>Bsub>=6r/min,转向如图,那么n<sub>6sub>=?转向如何?
A、n<sub>内sub>↑>n<sub>外sub>↓ B、n<sub>内sub>↑〈n<sub>外sub>↑ C、n<sub>内sub>↓>n<sub>外sub>↓ D、n<sub>内sub>↓n<<sub>外sub>↓
A、y<sub>n+1sub>〉y<sub>nsub>〉y<sub>n-1sub> B、y<sub>n+1sub>〈y<sub>nsub>〈y<sub>n-1sub> C、y<sub>n+1sub>=y<sub>nsub>=y<sub>n-1sub> D、不确定
A、U<sub>1sub>/U<sub>2sub>=N<sub>1sub>/N<sub>2sub>      B、U<sub>1sub>/U<sub>2sub>=N<sub>2sub>/N<sub>1sub> C、N<sub>1sub>/N<sub>2sub>=I<sub>2sub>/I<sub>1sub>       D、N<sub>1sub>/N<sub>2sub>=I<sub>1sub>/I<sub>2sub>
A、n<sub>0sub>’<n<sub>0sub>,特性硬度降低 B、n<sub>0sub>’<n<sub>0sub>,特性硬度不变 C、n<sub>0sub>’=n<sub>0sub>,特性硬度降低 D、n<sub>0sub>’>n<sub>0sub>,特性硬度降低
A、N<sub>1sub>=N<sub>2sub>=N<sub>3sub> B、N<sub>1sub>>N<sub>2sub>>N<sub>3sub> C、N<sub>2sub>>N<sub>1sub>>N<sub>3sub> D、N<sub>3sub> =N<sub>1sub>>N<sub>2sub>
A、T<sub>Nsub>=975P<sub>Nsub>n<sub>Nsub> B、T<sub>Nsub>=P<sub>Nsub>/n<sub>Nsub> C、T<sub>Nsub>=975P<sub>Nsub>2/n<sub>Nsub> D、T<sub>Nsub>=975P<sub>Nsub>/n<sub>Nsub>
A、n<sub>1sub>≈n<sub>2sub> B、n<sub>1sub>=n<sub>2sub> C、n<sub>1sub>>>n<sub>2sub> D、n<sub>1sub><<n<sub>2sub>