To prevent cave-ins, sloped or tiered walls may be used for trenches less than _____.


a. 10' deep
b. 15' deep
c. 20' deep
d. 25' deep


c. 20' deep

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The social costs of imperfect competition are known as

A) dead-weight loss. B) producer surplus. C) consumer surplus. D) none of the above.

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When soldering, flux should be applied to ____.

A. the male part of the joint only B. the female part of the joint only C. both the male and female parts of the joint D. around the mated parts

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Brushless PM motors have become very popular for ____ applications such as air handlers found in the air-conditioning field.

a. variable-speed b. increased-speed c. low-speed d. reduced-speed

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The FFA has members in all 50 states, as well as in Puerto Rico and the U.S. Virgin Islands

Indicate whether the statement is true or false

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