Multiple Choice
Message signs and arrow boards are used to direct traffic and safeguard workers on roads and highways. These devices were originally run by dieselpowered generators.Which of the following provides a practical way to power these mobile devices and is more efficient than a generator?
A) natural gas
B) water power
C) a geothermal system
D) a solar conversion system
Correct Answer:
Verified
Correct Answer:
Verified
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