A condition contributing to diesel engine piston rings sticking in the ring grooves, is insufficient ring clearance at the ring（）<br>A:gap<br>B:side<br>C:back<br>D:radial

A condition contributing to diesel engine piston rings sticking in the ring grooves, is insufficient ring clearance at the ring（）
A:gap
B:side
C:back
D:radial

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