CFCs can exist in the atmosphere for more than ____ years.
A. 20
B. 30
C. 50
D. 60
Answer: C
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Agriculture is not dying; it is changing
Indicate whether the statement is true or false.
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In alternators the welding current is produced on the ____.
A. brushes B. diode C. armature D. stator
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About ____% of U.S. cropland is irrigated
a. 13 b. 16 c. 19 d. 22
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The maximum rise for a set of stairs without a landing is typically _____ feet
a) 9 b) 10 c) 12 d) 15
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