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