The refrigerant that has primarily replaced CFC-12 is _____
a. HFC-134a
b. HFC-411
c. HCFC-22A
d. HFC-404A
a
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Which of the following is a form of precast construction?
a. steel frame b. masonry c. tilt-up d. none of the above
On a digital waveform, the transition time from a LOW level to a HIGH level is called ________
A) pulse width B) period C) fall time D) rise time
A computer's ________ unit takes instructions from the memory unit and interprets them
Fill in the blank(s) with correct word
A conductive probe measurement system uses electrodes suspended in a vessel. It is designed to start a pump at a low level limit and turn the pump off at a high level limit. What is the best description of the system?
A. invasive, single-point, indication B. invasive, multipoint, controlling C. noninvasive, multipoint, controlling D. noninvasive, single-point, controlling