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(1)一台美国约翰·迪尔4450型柴油拖拉机,工作到11 322小时时,发动机出现“铛铛”的敲击声。发动机转速表显示在800转/分左右时,响声清脆,当转速升至21 00
(1) A U.S. John Deere 4450 diesel tractor worked at 11 322 hrs and the engine beats “clang”. Engine tachometer shows 800 r / min when the sound crisp, when the speed rose to 21 00