Some fuel cell systems may require the use of an on-board reformer to extract ____ from liquid fuels such as gasoline, methanol, or ethanol.
A. hydrocarbon
B. oxygen
C. electrical energy
D. hydrogen
Answer: D
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Zebra _______ are typically smaller than most horses or mules.
Fill in the blank(s) with the appropriate word(s).
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The flat ____ joint can be made with or without the addition of filler metal. This joint is one of the easiest welded joints to make.
A. outside corner B. lap C. tee D. butt
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Good electrical insulators include:
A) Steel, iron, and aluminum. B) Copper, aluminum, and steel. C) Ceramic, rubber, and plastic. D) Gold, silver, and copper.
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A trench is an excavation that has a depth greater than its width, and a width that is no greater than _____
a. 10' b. 15' c. 20' d. 25'
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