一、由于温度变化而产生的测量误差精密测量长度时特别需要考虑温度变化的影响,这是计量人员早已熟知的常识。故必须保持测量场所的温度恒定,或按实际温度对测量值作修正。但保持测量场所温度恒定并不是一件容易的事 First, the measurement error due to temperature changes Precise measurement of length in particular need to consider the impact of temperature changes, which is already familiar with the common sense of measurement staff. Therefore, the temperature of the measuring place must be kept constant, or the measured value should be corrected according to the actual temperature. However, it is not easy to keep the temperature of the measurement site constant