A building is said to have sick-building syndrome when more than what percent of its occupants complain during a two-week period of symptoms that are alleviated when the occupants leave the building?
a. 20 percent
b. 25 percent
c. 50 percent
d. 80 percent
a. 20 percent
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Un tubo de subida es _____.
a. una tubería de distribución que pasa verticalmente a través de un mínimo de dos niveles b. un equipo utilizado para levantar materiales c. un catalizador para cemento de terminación d. una pieza de plomería conectada a un cabezal aspersor
The record would seem to indicate that President Eisenhower's strongest commitment during his presidency was to
A. social justice. B. social harmony. C. party loyalty. D. racial desegregation. E. political reform.
At about 2 inches long, young fish, called ____________________, are placed in ponds or put in cages
Fill in the blank(s) with correct word
The speed of sound in air is approximately 340 m/s. The speed of sound in steel is approximately 5900 m/s. If your friend strikes one end of a steel pipe with a hammer while you listen at the other end, you will hear two distinct sounds: one traveling through the air and the other traveling through the steel pipe. If the pipe is 200 meters long, how much time elapses between the two sounds?
What will be an ideal response?