Refrigeration systems that use nothing more than a thermostatically controlled solenoid valve feeding a distribution system can use ____________________ or ____________________ as their refrigerant.

Fill in the blank(s) with the appropriate word(s).


nitrogen, carbon dioxide

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Write the expression for travel demand on the bridge. Let V = travel demand.

A toll bridge carries 6,000 veh/day. The current toll is $3.50/vehicle. Studies have shown that for each increase in toll of 50 cents, the traffic volume will decrease by 500 veh/day. It is desired to increase the toll to a point where revenue will be maximized. What will be an ideal response?

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____________________ is graded on the basis of the fineness of the fibers

Fill in the blank(s) with the appropriate word(s).

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The float switch contacts may be either normally open or normally closed and ____.

a. may not be submerged b. may not be suspended c. may be submerged d. may be suspended

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Current ____ voltage in an inductor.

A. lags B. leads C. is equal to D. is always in phase with

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