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To prevent the spread of fire by convection you should _____.

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it, it    what, what    it, what    what, it  
take    to take    taken    taking  
take    to take    taken    taking  
cool the bulkheads around the fire  remove combustibles from direct exposure  close all openings to the area  shut off all electric power  
could spread  should have spread   would spread  might have spread  
it;it    what;what    it;what    what;it  
to spread  spreading  spread  to have spread  
that; it    it; it    that; what    it; what  
high pressure alarm  fire alarm  extinguishers  fusible plugs  
convection  conduction  radiation  ventilation  
it, it    what, what    it, what    what, it  
prevented    to prevent    would prevent    preventing  
it, it    what, what
  
it, what    what, it  
it, it    what, what    it, what    what, it  
convection  conduction  radiation  direct contact  
relight the boiler immediately to prevent loss of steam pressure  relight the fire off the brickwork as the bricks are cherry red  purge the furnace of any combustible gases before attempting to relight the fire  speed up the feed pump to prevent dry firing when the burner flame is reestablished  
making  from making  to make  made  

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