依据动量定理 ①D。,O m08++[(m)+aaV lr t a0- az r Pg +-(ro)+ 00-0w+y(ro 06 +u dug u, ue 06 P8a+-[(ro)+ 00+0+(rod 06 az L + 06 n8:+0 rO.)+ +—(r 00 az依据动量定理 1 [ ( ) ( )] r z Du p g rp rp Dt r r z        = + + +    2 1 [ ( ) ( )] 1 [ ( ) ( )] 1 [ ( ) r r r r r z r x rr zr r r z r r z z z z z r z z rz u u u u u u u u t r r z r g r r r r z u u u u u u u u u t r r z r g r r r r z u u u u u u u t r r z g r r z                                        + + + −        = + + − +        + + + +        = + + + +        + + +       = + +  ( )] z zz r z    +  