Why should ultraviolet germicidal lamps not be handled with bare hands?
A) The coating on the outside of the lamps is toxic
B) The oil from your fingerprints can lead to premature failure of the lamp
C) The exterior UV coating will wipe off, reducing the UV output
D) The residual UV in the lamp coatings can cause severe burns
B
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¿Cuál es la cantidad máxima de disyuntores o conjuntos de fusibles que se pueden utilizar como medio de desconexión de servicio en un panel de servicio principal sin un interruptor principal?
a. 2 b. 4 c. 6 d. 8
The main reason a species declines in population is because _____
a. destruction of habitat b. sport hunting c. disease d. market hunting
Some irrigation systems have stimulated the formation of saline and saline-sodic soils. Which of the following contributes to this process?
A) inadequate drainage systems to remove soluble salts B) low pH of the irrigation water C) high Ca and Mg contents in the irrigation water D) high contents of sulfates and chlorides in the irrigation water E) the low sodium adsorption ratio in the irrigation water
What process causes dew to form on grass?
A) Deposition B) Condensation C) Vaporization D) Freezing