What is the air we breathe made up of?
A. 51 percent oxygen and 49 percent nitrogen
B. 21 percent oxygen and 78 percent nitrogen
C. 21 percent nitrogen and 78 percent oxygen
D. 12 percent oxygen and 88 percent nitrogen
Answer: B
You might also like to view...
Which are good reasons to place chillers on the top floor rather than the basement of a high-rise? Select all that apply.
A) Less piping to the cooling tower on the roof. B) Easier access for maintenance supplies. C) The extra mass helps as a damper in seismic areas. D) Vibration is less problematic.
An insulated wall divides two _____.
a. environmental domains b. controlled spaces c. temperature gradients d. humidity zones
A method called _____ gives people in urban areas another way of growing food ?by replacing regular plants with plants that produce food
A) covered boxing? B) edible landscaping? C) raised bedding? D) hoop housing
Which electronic discharge sensitive (ESD) class has a sensitivity range from 0 - 999 volts?
a. Class I. b. Class II. c. Class III. d. Class IV.