When an engine has good combustion (proper compression and volumetric efficiency, proper spark timing and delivery, and a stoichiometric air-fuel ratio), which level of gas emissions should be high?
A. CO emissions
B. CO2 emissions
C. O2 emissions
D. NOX emissions
Answer: B
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Fill in the blank(s) with the appropriate word(s).
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Fill in the blank(s) with correct word
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