A、Z<sub>2sub>Z<sub>3sub>/(Z<sub>2sub>+Z<sub>3sub>) B、Z<sub>1sub>+Z<sub>2sub>Z<sub>3sub>/(Z<sub>2sub>+Z<sub>3sub>) C、Z<sub>1sub>+Z<sub>2sub>+Z<sub>3sub> D、Z<sub>1sub>+(Z<sub>2sub>+Z3)/(Z<sub>2sub>Z<sub>3sub>)
A、Z<sub>2sub>Z<sub>3sub>/(Z<sub>2sub>+Z<sub>3sub>) B、Z<sub>1sub>+Z<sub>2sub>Z<sub>3sub>/(Z<sub>2sub>+Z<sub>3sub>) C、Z<sub>1sub>+Z<sub>2sub>+Z<sub>3sub> D、Z<sub>1sub>+(Z<sub>2sub>+Z3)/(Z<sub>2sub>Z<sub>3sub>)
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、Z<sub>1sub> B、Z<sub>2sub> C、Z<sub>1sub>+Z<sub>2sub> D、Z<sub>1sub>+Z<sub>2sub>+h<sub>wsub>
A、U<sub>bsub>+U<sub>1sub>-U<sub>2sub>=0 B、U<sub>bsub>-U<sub>2sub>+U<sub>1sub>=0 C、U<sub>bsub>+U<sub>1sub>+U<sub>2sub>=0 D、U<sub>bsub>-U<sub>1sub>-U<sub>2sub>=0
A、Ez=E<sub>0sub>/(1+z/Rp) B、Ez=E<sub>0sub>/(1-z/R<sub>50sub>) C、Ez=E<sub>0sub>/(1+z/R<sub>50sub>) D、Ez=E<sub>0sub>(1+z/R<sub>50sub>) E、Ez=E<sub>0sub>(1-z/Rp)
A、D<sub>1sub>截止,D<sub>2sub>导通 B、D<sub>1sub>导通,D<sub>2sub>截止 C、D<sub>1sub>导通,D<sub>2sub>导通 D、D<sub>1sub>截止,D<sub>2sub>截止
A、i=ω<sub>1sub>/ω<sub>2sub> B、i=Z<sub>2sub>/Z<sub>1sub> C、i=n<sub>1sub>/n<sub>2sub> D、i=d<sub>2sub>/d<sub>1sub>
A、i=n<sub>1sub>/n<sub>2sub> B、i=d<sub>1sub>/d<sub>2sub> C、i=z<sub>1sub>/z<sub>2sub> D、i=T<sub>1sub>/ηT<sub>2sub>
A、I<sub>1sub>-I<sub>2sub>+I<sub>3sub>=5A B、I<sub>1sub>-I<sub>2sub>+I<sub>3sub>=-5A C、-I<sub>1sub>+I<sub>2sub>-I<sub>3sub>=0 D、I<sub>1sub>+I<sub>2sub>+I<sub>3sub>=0