D为双抛物面,平面及所围成的区域，则()/ananas/latex/p/252552/ananas/latex/p/149974/ananas/latex/p/106434/ananas/latex/p/252553
D为双抛物面,平面及所围成的区域，则()/ananas/latex/p/252552/ananas/latex/p/149974/ananas/latex/p/106434/ananas/latex/p/252553
1