What do these symbols indicate?





A) Fluid particle motion

B) An open check valve

C) A variable check valve

D) A diode


B) An open check valve

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ow do programmable logic controllers scan a program?

What will be an ideal response?

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Furrow irrigation floods whole section of field separated by dikes

Indicate whether the statement is true or false.

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Can changes in atmospheric pressure affect refrigeration gauge pressure readings?

A) Changes in atmospheric pressure can affect the final reading by changing the calibration point of the gauges. B) Atmospheric pressure changes can affect high-pressure gauge readings, but not compound gauge readings. C) Atmospheric pressure changes can affect compound gauge readings, but not high-pressure gauge readings. D) Since refrigeration systems are closed to the atmosphere, atmospheric pressure has no effect on refrigeration gauge pressure readings.

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Rigid insulation can be installed on the interior surfaces of a foundation if the walls _____

a. are adequately waterproofed b. are poured concrete, not block c. have had furring strips applied d. have cured at least 72 hours

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