Approximately ____ percent of fire fighters in the United States are volunteers.

a. 55
b. 73
c. 46
d. 34


Answer: b. 73

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How often are certified organic farms inspected?

a. once a year c. three times a year b. twice a year d. every other year

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Antioxidants are used in petfoods to prevent oxidative losses of fat-soluble vitamins and pigments as well as to prevent or delay the onset of flavor deterioration. Examples include

A. BHA B. BHT C. TBHQ D. Propyl gallate E. All of the above

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Bar screens and grit chambers are used

a. only in primary wastewater treatment plants b. in most municipal wastewater treatment plants c. very rarely due to applications of modern technology d. only in advanced wastewater treatment plants e. in most municipal water supply facilities

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The ________ array is the most popular type of PLD programmable array

A) XOR B) AND C) OR D) NAND

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