A possible cause for an individual piston to knock when at TDC on a slow-speed, two-stroke/cycle main propulsion diesel engine could be due to （）<br>A:early fuel injection<br>B:excessive bearing play within the running gear<br>C:overloading of the cylinder<br>D:all of the above

A possible cause for an individual piston to knock when at TDC on a slow-speed, two-stroke/cycle main propulsion diesel engine could be due to （）
A:early fuel injection
B:excessive bearing play within the running gear
C:overloading of the cylinder
D:all of the above

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