Broken piston rings manifest themselves during the scavenge port inspection by（）<br>A:Lack of elastic tension, when the rings are pressed into the groove by means of a stick<br>B:Blackish appearance<br>C:Fractured rings and missing rings<br>D:all off the above

Broken piston rings manifest themselves during the scavenge port inspection by（）
A:Lack of elastic tension, when the rings are pressed into the groove by means of a stick
B:Blackish appearance
C:Fractured rings and missing rings
D:all off the above

出自：海船船员证

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