我们提出了闭合误差的概念，作为仪器测量精度的判据，测量仪器的瞬时均方差，以表征测量的重复性和可靠性。
We suggest "error of closure" asa criterion of measuring accuracy and use transient root-mean-square error to ex-press repeatability and reliability of measurement of the instrument.
瞬时转速的测量采用双传感器法，阐明了其结构及工作原理，并对其测量精度进行分析。
The transient speed was measured by dual sensors method, of which the structure and constitution were described and the measurement accuracy was analyzed.
由于可以瞬时地改变和启闭料流，所以给料量有较高的精度。
Due to the instantaneous to change and open/close material flow, so had a higher accuracy of quantificationally.
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