How can a confined space, such as a walk-in cooler or underground tunnel become a safety hazard?
A) Cell phones do not receive service in confined spaces.
B) The oxygen is limited; long exposure can cause suffocation.
C) Electricity flows more readily in a confined space.
D) The nitrogen can combine with carbon dioxide to form a toxic gas.
B
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Match the refrigerant cylinder with the correct color code.
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____________________ are, by far, the most widely used electrical component.
Fill in the blank(s) with the appropriate word(s).
Microcontrollers integrate common peripherals with a ________
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