Compared to the horizons below it, the A horizon:
a. is darker c. has less organic material
b. is lighter d. contains more clay
A
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When using a recovery machine manufactured before November 15, 1993, the recovery level for Type II systems containing over 200 pounds of R-22 refrigerant is:
A) 10" hg vacuum. B) 0 psig. C) 15" hg vacuum. D) 4" hg vacuum.
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Brass is a widely used alloy of ____.
A. copper and zinc B. copper and tin C. phosphorous and bronze D. copper and bronze E. none of the above
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