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实例一 故障现象:一辆NF125型摩托车,已行驶了15000公里,发动机性能基本正常,最近以来怠速不稳,忽高忽低。
Example A failure phenomenon: a NF125 motorcycle, has been driving 15,000 km, the engine performance is normal, the recent idling instability, fluctuated.