According to the UN, an African country that historically provided 100 percent of the population's food needs now provides:

A. 50 percent
B. 60 percent
C. 70 percent
D. 80 percent


Answer: D

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Adjacent structural insulated wall panels in a SIP building are connected through

A) 2-by lumber studs. B) OSB splines. C) engineered lumber splines. D) any one of the above. E) special sheet metal connectors.

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Para la definición de la cámara de humo, si el espacio entre la parte superior de una pared baja y el techo es inferior a 18" (45,72 cm), la pared es considerada:

a. una barrera. b. un límite. c. una rejilla abierta. d. un espacio entre vigas.

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Before beginning a cutting operation, you should complete a _____.

a. safety survey b. hazard awareness worksheet c. project assessment d. job hazard analysis

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What happens when you repeatedly cycle the magnetic field up and down?

A. Radioactive decay B. Hysteresis loops C. Total inductance D. A transient state

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