According to ___________, crossbred animals are generally healthier and grow faster than purebred ones
a. Homogenesis c. Hybrid vigor
b. Superior selection d. Heterogenesis
C
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If a compressed-air tool functions poorly because of low air pressure, the cause is most likely _____.
a. working at too great a distance from the compressor b. an undersized air receiver c. an improperly secured hose or coupling d. a sticky air throttle valve
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Of the nutrients needed by most plants, ____ come from soil
a. three b. twenty c. most d. all
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What is the strongest of all the fabrics made from natural fibers?
a. Cotton c. Wool b. Silk d. Linen
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When the burner shuts off, the pump output pressure drops below 80 psig. This indicates:
A) That the oil nozzle needs changing. B) That the oil filter is clogged. C) Correct operation. D) That the oil pump has a leaky shutoff.
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