An open-loop system is practical only if

A) the secondary refrigerant loop temperature can be closely monitored.
B) a local stream or pond can be used as the water supply
C) local codes allow discharge of non-toxic anti-freeze solutions into the water supply
D) there is an adequate supply of water and it is of good quality.


D

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The same types of organisms that cause plant diseases also cause animal diseases

Indicate whether the statement is true or false

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If the current wave is centered about the zero axis, then it is called a(n) ____________________ current.

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

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If excessive ice forms on the evaporator of a domestic freezer, which of the following is not a possible cause?

A. defective defrost timer B. dirty or blocked condenser C. defective defrost heater D. blocked evaporator

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Which type of duct system has the longest life expectancy?

A. galvanized metal B. fiberglass-wrapped, spiral duct (flexible duct) C. fiberglass, fiberboard sheeting D. round sheet metal

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