To Make Combustion Efficiency Tests, a Hole Must Be Made

question 28

Multiple Choice

To make combustion efficiency tests, a hole must be made ____.

• A) in the flue pipe after the draft control
• B) in the flue pipe before the draft control
• C) over the fire at the observation door
• D) under the draft hood

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Chemicals in the brain that transmit signals from one neuron to another, influencing countless functions including mood and behavior.

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The space between two neurons where neurotransmitters are released from one neuron to another.