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Question
Poisonous fumes can enter the cab due to:
Answers
A.  A defective exhaust system.
B.  The wrong type of fuel being used.
C.  A lack of oil in the engine.
D.  Under-inflated tires.
Explanation
Defects in an exhaust system are very dangerous because they can cause poisonous fumes to enter the cab or sleeper berth.
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