火箭三R中气缸压缩为零。有人知道原因吗?

Could you give us more information on your situation- the bike, what happened to lead you to doing a compression test.
When I started the car, I heard an unusual exhaust sound and the instrument panel light came on. The computer detected the fault code P0068. I touched the exhaust pipe and the middle temperature was very low, so I concluded there was a problem with the middle cylinder. Test results: The compression value of the middle cylinder was 0.
 
Un huh- what kind of "car?"