_____ control of insects uses predatory insects, fungi, or viruses
a. Biological c. Chemical
b. Histological d. Physiological
A
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What is workability of concrete and how is it related to concrete's slump?
What will be an ideal response?
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Concrete cures to its maximum strength, under normal conditions, in about _____.
a. 7 days b. 14 days c. 21 days d. 28 days
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Lower cutting speeds are used when machining:
A) Tough materials B) Hard materials C) Abrasive materials D) All of the above
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How Btus must be removed from one pound of 32 degree water to change it to one pound of 32 degree ice?
A. 16 B. 144 C. 180 D. 970
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