Sand and silt are chemically composed mostly of:

a. silica c. aluminum
b. potassium d. magnesium


A

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El punto de un objeto alrede- dor del que está concentrado el peso es _____.

a. el eje inclinado b. el centro de gravedad c. el punto de apoyo incli- nado d. el brazo de palanca de la carga

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Stringless paving typically uses either total robotic stations with 3-D modeling or a global positioning system (GPS) with lasers to _____.

a. control the horizontal and vertical movement of a slip-form paver b. pinpoint hairline cracks or similar defects before pavement is removed c. help workers align stationary forms for concrete or HMA paving d. provide the heat necessary to cure concrete or HMA pavement

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Fan-out for a typical TTL gate is ________

A) 100 B) 54 C) 4 D) 10

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Sources of on the job stress involve all of the following except: