The Reader's Digest, Volumen109Reader's Digest Association, 1976 |
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Página 138
... heating fuel or electric heat is possible , why is there any question about the attrac- tiveness of solar heating ? A. The cost of purchased energy isn't the only factor . There is also the high cost of the solar installa- tion . And ...
... heating fuel or electric heat is possible , why is there any question about the attrac- tiveness of solar heating ? A. The cost of purchased energy isn't the only factor . There is also the high cost of the solar installa- tion . And ...
Página 141
... heat . During the day , the sun heats the panels , which in turn heat either air , water , or an anti- freeze - and - water mixture to tem- peratures of 100 to 150 ° F. , or even higher . The heated air or water is then piped to a ...
... heat . During the day , the sun heats the panels , which in turn heat either air , water , or an anti- freeze - and - water mixture to tem- peratures of 100 to 150 ° F. , or even higher . The heated air or water is then piped to a ...
Página 145
... heat to steri- lize the jar and its food contents , killing all spoilage- and disease- producing micro - organisms ... heat . And then the jar must be tightly sealed to prevent new contamination . How much heat depends on many ...
... heat to steri- lize the jar and its food contents , killing all spoilage- and disease- producing micro - organisms ... heat . And then the jar must be tightly sealed to prevent new contamination . How much heat depends on many ...
Contenido
Special America 1776 | 2 |
The Shocking Truth About MedicalLab Reports | 57 |
The Shoo | 61 |
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