Excessive diesel engine back pressure may be an indication of （）<br>A:carbon buildup in the exhaust manifold<br>B:overcooling of the exhaust manifold<br>C:eroded muffler baffle plates<br>D:high injection pressure

Excessive diesel engine back pressure may be an indication of （）
A:carbon buildup in the exhaust manifold
B:overcooling of the exhaust manifold
C:eroded muffler baffle plates
D:high injection pressure

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