One end of the tube 44 is in communication with {HEAD ~ a central portion} of {TAIL ~ the tube} 45, and the other end of the tube 44 is formed with a gas supply hole 41 
of
One end of the tube 44 is in communication with { HEAD ~ a central portion } of { TAIL ~ the tube } 45 , and the other end of the tube 44 is formed with a gas supply hole 41
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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