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介绍了汽车发动机活塞凸出量的测量方法及测试设备的在线计量，并给出了由误差的变化估算计量周期的方法。把计量标准引入生产线，保证了测试设备在工作周期内的可靠性。
The measurement method of piston protruding amount of automobile engine and the on-line measurement of test equipment are introduced. The method of estimating the measurement period from the variation of error is given. The introduction of measurement standards into the production line, to ensure the reliability of the test equipment in the work cycle.