La irritación de la piel que puede ocasionar la exposición al cemento se denomina _____.

a. escoriación por cal
b. reacción puzolana
c. dermatitis del cemento
d. reacción al cemento


Answer: C

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____________________ corrosion is an electrochemical process that causes corrosion where two dissimilar metals touch.

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

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The first major transportation project in the United States, which ran 62 miles and was completed in the 1790s, that proved to be a stimulus for western economic developments was the

A. Baltimore and Ohio Railroad. B. National (Cumberland) Road. C. Erie Canal. D. St. Lawrence Seaway. E. Lancaster Turnpike.

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Why would a temperature-differential defrost system not complete the defrost cycle?

A) There is a refrigerant undercharge. B) The fan blows warm air across the coil. C) There is too much heat available during defrost. D) The system defrosts too frequently.

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The condenser in a refrigeration system ____.

A. desuperheats the vapor from the compressor B. condenses the vapor from the compressor C. subcools the liquid refrigerant before it leaves the condenser D. all of the above

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