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
A ____ restricts pressure to around 30 psi for air-drying parts.
A. drill motor B. bench grinder C. pedestal grinder D. safety blowgun
Dry ice is composed of ____.
A. liquid nitrogen B. liquid carbon dioxide C. solidified carbon dioxide D. solidified ammonia
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.