What actuates the relay piston in a foot valve on an air brake system when the valve is operating normally?

A. Foot pressure
B. Air pressure
C. Spring pressure
D. Mechanical pressure


B. Air pressure

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The exchange complexes of strongly acid (pH 4.5 ) mineral soils are saturated mainly with ________

A) exchangeable Al(OH2)+ ions B) tightly bound Al3+ ions C) tightly bound H+ ions D) exchangeable H+ ions E) exchangeable Al3+ ions

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To avoid electrical shock, what class fire extinguisher should be used on electrical equipment?

A) Class D B) Class B C) Class C D) Class A

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A paint department uses 8 gallons of paint per week. How many gallons of paint are needed for a year?

What will be an ideal response?

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Practically all room air conditioners used in commercial buildings are ____ style.

A. casement B. fixed mount C. sleeve mount D. all of the above

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