Which of the following statements concerning cylinder liner wear is true?（）<br>A:Liner wear is distributed equally between the upper and lower portions of the cylinder<br>B:Excessive liner wear causes wear between piston ring and groove<br>C:Excessive, but uniform liner wear will not cause wear between piston ring and groove<br>D:Liner wear is normally greatest in the middle of the cylinder

Which of the following statements concerning cylinder liner wear is true?（）
A:Liner wear is distributed equally between the upper and lower portions of the cylinder
B:Excessive liner wear causes wear between piston ring and groove
C:Excessive, but uniform liner wear will not cause wear between piston ring and groove
D:Liner wear is normally greatest in the middle of the cylinder

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