What is the most popular shape of a waveguide?

A. Octagonal
B. Circular
C. Rectangular
D. Square


C

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Corrosion occurs within boilers and other hydronic system components because _____.

a. water itself is naturally corrosive b. impurities are always present in iron and steel c. air dissolved in water contains oxygen d. air dissolved in water contains nitrogen

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A ____ restricts pressure to around 30 psi for air-drying parts.

A. drill motor B. bench grinder C. pedestal grinder D. safety blowgun

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Dry ice is composed of ____.

A. liquid nitrogen B. liquid carbon dioxide C. solidified carbon dioxide D. solidified ammonia

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Which one of the following statements about number systems is NOT true?

A) The hexadecimal system uses the base 16 with numbers 0 through 9 and the letters A, through F. B) The binary system uses just two digits to represent the value of every number. C) The octal system uses digits 0 to 8. D) All number systems have a radix with position and weight values.

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