今=4x+Lpg y/=L(1-l)(-P)g (1-E)2 1-E0u △p=150 +1.75 E'(d2)2 Re ReB a(1-E)6(1-E)2 2 3 2 3 (1 )( ) (1 ) 1 150 1.75 ( ) Re Re (1 ) 6(1 ) f f s f ev ev p B p p L g p L g u u p d d u a                  =  +  = − − − −  = + = = − −