Because electric tools spark, portable electric tools should never be started or operated in the presence of propane, natural gas, gasoline, paint thinner, ____, or other flammable vapors.
A. acetylene
B. tungsten
C. carbon
D. aluminum
Answer: A
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?When chemical, electrical, or light energy excites electrons, the radiation of light is called ____.
A. ?phosphorescence B. ?luminescence C. ?iridescence D. ?fluorescence
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_____________ U. S. businesses produce, store or transport toxic industrial materials?
Fill in the blank(s) with the appropriate word(s).
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Animals in the feedlot are fed a high-roughage ration
Indicate whether the statement is true or false
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If a diode shows both low forward and low reverse resistance, it is probably ____.
A. opened B. shorted C. germanium D. silicon
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