单选题Visual inspection of chrome-plated piston compression rings reveals a black ring face at the position of the cylinder liner portsThis condition indicates a ring which（）Ahas a crown-faceBexceeds wear limits through normal wearChas excessive blow-byDis in good condition
单选题
Visual inspection of chrome-plated piston compression rings reveals a black ring face at the position of the cylinder liner portsThis condition indicates a ring which（）
A
has a crown-face
B
exceeds wear limits through normal wear
C
has excessive blow-by
D
is in good condition
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