neutron-neutron(n-n)logging
neutron epithermal neutron log
neutron thermal neutron log
coupling mechanism between upper level and low level jet
fiscal system at county level and township level
interaction between upper level and lower level
municipal level and county level
Ratio of row spacing to plant spacing
~(241)Am-Be neutron source
~(241)Am-Be neutron source element
~(252)Cf neutron source
~(252)Cf 中子源
~(252)Cf中子源
252Cf中子源
241Am- 9Be neutron source