Multiple Choice
Which gas indicates efficiency? (The higher the level of this gas, the more efficient the engine is operating.)
A) HC
B) CO
C) CO2
D) O2
Correct Answer:

Verified
Correct Answer:
Verified
Related Questions
Which gas indicates efficiency? (The higher the level of this gas, the more efficient the engine is operating.)
A) HC
B) CO
C) CO2
D) O2
Correct Answer:
Verified