The contribution of efficiency to U.S. energy services is
A) less than the contribution of oil but still significant.
B) insignificant.
C) larger than the contribution of oil.
D) about as large as the contribution of oil.
C
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A(n) ______ website organizes webpages into categories and subcategories.
A. hierarchical B. webbed C. linear D. structured
What did Robert Brown see in his microscope?
A) straight-line motion B) circular motions C) parabolic motions D) random motions
During the course of a demonstration the professor is called away. When he returns he finds a beaker of water that was at room temperature is now at a slightly higher temperature. There is a stirring rod on the desk and a cigarette lighter. The professor can assume that the temperature increase is due to
A. heat added to the system. B. either heat added or mechanical work done. C. mechanical work done on the system.
For water droplets to form, what must be present?
a. Smog b. Hygroscopic nuclei c. Carbon dioxide d. Ozone