____________________ pressure is the difference in pressure between the cut-in or turn-on pressure and the cut-out or turn-off pressure.
Fill in the blank(s) with the appropriate word(s).
Differential
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The only type of soil that can be excavated with 90-degree walls without protection is _____.
a. Type A b. stable rock c. Type C d. Type B
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Most metal stairways _____.
a. require little or no fabrication b. solvent welded c. are welded d. extruded
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Electronic controls are commonly called ____.
A. discrete digital controls B. direct analog controls C. direct digital controls D. discrete event controls
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If a welder is not engaged in the specific process of welding for which he or she is qualified for a period exceeding ____, the welder must requalify.
A. two months B. six months C. one year D. two years
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