Two Technicians Are Describing Measuring Opacity

Two technicians are describing measuring opacity. Technician A says that you use a chart to match the darkness of the exhaust plume against an appropriate scale-measuring opacity and record the results. Technician B says that visible exhaust smoke for more than 30 seconds over a 1-minute period indicates a major defect in the engine combustion system. Who is right?

A) A only"
B) B only"
C) Both A and B
D) Neither A nor B"

Correct Answer:

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