Alternatively, if the area of the openings 45 is small, the heat emission part 20 is disposed such that {HEAD ~ one heat emission part} 20 corresponds to {TAIL ~ a plurality} of openings 45 
corresponds to
Alternatively , if the area of the openings 45 is small , the heat emission part 20 is disposed such that { HEAD ~ one heat emission part } 20 corresponds to { TAIL ~ a plurality } of openings 45
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH