When {HEAD ~ nitrogen dioxide gas} enters the pores of the nitrogen dioxide gas sensor element with the above arrangement and is adsorbed to {TAIL ~ the pores}, the diazotizing reagent reacts with nitrous ions produced by the nitrogen dioxide gas to produce a diazo compound 
is adsorbed to
When { HEAD ~ nitrogen dioxide gas } enters the pores of the nitrogen dioxide gas sensor element with the above arrangement and is adsorbed to { TAIL ~ the pores } , the diazotizing reagent reacts with nitrous ions produced by the nitrogen dioxide gas to produce a diazo compound
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH