  In this paper, the notions of nonnil-injective modules and
nonnil-FP-injective modules are introduced and studied. Especially, we show
that a $\phi$-ring $R$ is an integral domain if and only if any
nonnil-injective (resp., nonnil-FP-injective) module $R$-module is injective
(resp., FP-injective). Some new characterizations of $\phi$-von Neumann regular
rings, nonnil-Notherian rings and nonnil-coherent rings are given. We finally
characterize $\phi$-Dedekind rings and $\phi$-\Prufer\ rings in terms of
$\phi$-flat modules, nonnil-injective modules and nonnil-FP-injective modules.
