Infrared radiation is produced naturally by all materials at temperatures above _____
a. freezing
b. absolute zero
c. 10°C
d. -50°F
b
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An edge weld symbol may also be applied to an edge ____________________.
Fill in the blank(s) with the appropriate word(s).
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When lowering soil pH, materials used are sulfur, lime, and iron sulfate
Indicate whether the statement is true or false
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Sod should not be cut more than _____ inch(es) thick
A) 1 B) 2 C) 3 D) 4
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Smog contains ________, which is an irritant to lungs and eyes
A) N2 B) O3 C) CO2 D) O2
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