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Ex7 By sucking a straw a boy can reduce the pressure in his lungs to 50 mm of HgEx7 By sucking a straw a boy can reduce the pressure in his lungs to 50 mm of HgEx7 By sucking a straw a boy can reduce the pressure in his lungs to 50 mm of HgEx7 By sucking a straw a boy can reduce the pressure in his lungs to 50 mm of HgEx7 By sucking a straw a boy can reduce the pressure in his lungs to 50 mm of HgEx7 By sucking a straw a boy can reduce the pressure in his lungs to 50 mm of HgEx7 By sucking a straw a boy can reduce the pressure in his lungs to 50 mm of HgEx7 By sucking a straw a boy can reduce the pressure in his lungs to 50 mm of HgEx7 By sucking a straw a boy can reduce the pressure in his lungs to 50 mm of HgEx7 By sucking a straw a boy can reduce the pressure in his lungs to 50 mm of HgEx7 By sucking a straw a boy can reduce the pressure in his lungs to 50 mm of HgEx7 By sucking a straw a boy can reduce the pressure in his lungs to 50 mm of HgEx7 By sucking a straw a boy can reduce the pressure in his lungs to 50 mm of HgEx7 By sucking a straw a boy can reduce the pressure in his lungs to 50 mm of Hg
Ex7 By sucking a straw a boy can reduce the pressure in his lungs to 50 mm of Hg