Which kind of bee works to keep the hive clean?
a. King c. Queen
b. Drone d. Nursery
D
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In the nitrogen cycle, atmospheric N is fixed by what 2 methods?
A. mammals and fungi B. plants and soil C. fish and birds D. Rhizobium and lightning
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The two causes of thrust failure are improper installation and improper _____
A) lubrication B) application C) tightening D) loading
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Most dual-voltage motors bring out ____ "T" leads at the terminal box.
A. three B. six C. nine D. ten
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When an appliance is _____________ vented, fresh air is brought straight to the unit through a pipe that runs from outside the building to the combustion chamber of the appliance.
a. direct b. power c. mechanical d. induced
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