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Under pressure from animal welfare groups, two national science teachers associations have adopte...

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under high pressure  under low pressure  heated to reduce viscosity  cooled to increase viscosity  
The equipment divers use.  The effects of pressure on gases in the human body.  How to prepare for a deep dive.  The symptoms of nitrogen bubbles in the bloodstream.  
pick up    turn up    break up    build up  
alternator  glass thermometer  burdon tube  piezoelectric pressure transducer  
a; a      the; the         a;/         /;a  
injecting fuel oil into a cylinder  removing exhaust gases from the cylinder  forcing air into the cylinders under pressure after the exhaust valve has dosed  a combination of all the above  
under way  under control   under pressure  under repair  
a; a      the; the        a;/        /;a  
It forms bubbles.  It goes directly to the brain.  It is reabsorbed by the lungs.  It has a narcotic effect.  
compressor/condenser  condenser/evaporator  throttle valve/evaporator  evaporator/condenser  
Rise slowly.  Breathe faster.  Relax completely.  Breathe helium.  
he stepped down from the post of the founder of AOL  he used to be the chairman of AOL Time Warner  he had to resign from his post under pressure from Turner and Crawford  he will meet with opposition from Capital Research to remain on the board  
yields  starts  surfaces  travels  
Pressurized helium.  Nitrogen diffusion.  Nitrogen bubbles.  An air embolism.  

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