Ultrasonic leak detectors detect refrigerant leaks by:
A) Seeing the refrigerant by sensing the effect that the leaking refrigerant gas has on sonar.
B) Seeing the change in ultraviolet radiation around the area of the leak.
C) Hearing the high frequency of the escaping gas.
D) Seeing the change in infrared radiation around the area of the leak.
C
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Indicate whether the statement is true or false.
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