Conservation tillage preserves soil and water by leaving crop residue on the soil surface to act as
____________________.
Fill in the blank(s) with the appropriate word(s).
ANS: mulch
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Discuss the basic differences (in terms of chemical composition and important properties) among wrought iron, cast iron, and steel. Where would you recommend the use of wrought iron?
What will be an ideal response?
Modern day engines can have _____ valves per cylinder.
A. two B. three C. four D. all of the above
What is the sum of the interior angles of an octagon?
Fill in the blank(s) with the appropriate word(s).
One difference between refrigerant piping practices for air-conditioning systems and refrigerant piping practices for commercial refrigeration systems is that:
A) The suction lines on air-conditioning systems do not require insulating because of their higher temperature. B) Most commercial refrigeration system manufacturers do not recommend oil traps. C) Most air-conditioning manufacturers do not recommend oil traps. D) Suction lines are typically larger for air-conditioning applications for the same capacity of commercial refrigeration systems.