  We study transport properties of topological Weyl nodal-line
semimetals(NLSs). Starting from a minimal lattice model with a single nodal
loop, and by focusing on a normal-metal-NLS-normal-metal junction, we
investigate the dependence of the novel transport behavior on the orientation
of the nodal loop. When the loop is parallel to the junction interfaces, the
transmitted current is found to be nearly fully spin-polarized.
Correspondingly, there exists a spin orientation, along which the incident
electrons would be totally reflected. An unusual resonance of half transmission
with the participation of surface states also occurs for a pair of incident
electrons with opposite spin orientations. All these phenomena have been shown
to originate from the existence of a single forward-propagating mode in the NLS
of the junction, and argued to survive in more generic multi-band Weyl NLSs.
