The Reader's Digest, Volúmenes17-18Reader's Digest Association, 1930 |
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Página 429
... minutes after the take- off he had climbed to 10,000 feet . Another minute , and , as he reached 12,000 feet , he turned on the oxygen from his supply tanks , so that his lungs might breathe properly . Ten minutes and he was still climb ...
... minutes after the take- off he had climbed to 10,000 feet . Another minute , and , as he reached 12,000 feet , he turned on the oxygen from his supply tanks , so that his lungs might breathe properly . Ten minutes and he was still climb ...
Página 445
... minutes and rest one minute . In heavier work , such as carrying pigs of iron , fatigue is least when each twelve minutes of work is followed by three minutes of rest . It is a paradox of mankind that by resting at the proper times they ...
... minutes and rest one minute . In heavier work , such as carrying pigs of iron , fatigue is least when each twelve minutes of work is followed by three minutes of rest . It is a paradox of mankind that by resting at the proper times they ...
Página 942
... minutes on the average , in- stead of seven and one - half minutes five years ago ? By the fact that the cost of a telephone call between San Francisco and New York has been reduced in three years from $ 16.50 to $ 9 , 1931 , Review of ...
... minutes on the average , in- stead of seven and one - half minutes five years ago ? By the fact that the cost of a telephone call between San Francisco and New York has been reduced in three years from $ 16.50 to $ 9 , 1931 , Review of ...
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