In a fuel cell there is no combustion; the reaction is purely ____________________.
Fill in the blank(s) with the appropriate word(s).
chemical
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Los materiales de revestimiento más pesados se utilizan sobre todo en ____.
a. calderas, tuberías y conductos de humo b. bombas c. recipientes horizontales d. recipientes verticales
In 2007 the world’s population was estimated to be 6.7 billion people. The UN forecasts the population will begin to level off at 9.2 billion people in 2050. What is the population growth rate in percent over this period of time?
What will be an ideal response?
Which statement concerning fast-packet multiplexing is not true?
A) it operates on the premise that circuits may be oversubscribed in the same way that stadium seats are oversold, with the understanding that not every subscriber user will be on line at the same time B) it is much more efficient than TDM or FDM C) it is a method used to transmit information D) none of the above (all are true)
Ultrasonic monitors are very effective at detecting cracks in _____ materials
A) thick B) thin C) surface D) hot