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单选题
A bright shiny appearance of the sealing surfaces on diesel engine compression rings indicates（）
A
combustion gas blow-by
B
excessive lubrication
C
properly functioning rings
D
insufficient cylinder cooling
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单选题class Mineral { static String shiny（） { return "1"； } } class Granite extends Mineral { public static void main（String [] args） { String s = shiny（） + getShiny（）； s = s + super.shiny（）； System.out.println（s）； } static String getShiny（） { return shiny（）； } } 结果为：（）A
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编译失败
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its back shiny green and its throat is bright redC
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its back shiny green and its throat bright red
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