... as fossil and non-fossil fuels; the former, formed from animal and plant matter over thousands of years, while the latter comprises radioactive-associated materials. Coal, oil and natural gas ... sophisticated equipment; and certain parts of nuclear and hydro plants may call for much higher than normal specifi cations and greater amounts than is found in fossil plants. Sea- sonal variation...
Ngày tải lên: 03/01/2014, 22:44