primary instrument

• 一次测量仪表,初级仪表,主要仪器,一次仪表

primary instrument的用法和样例：

例句

1. In the paper, a kind of artificial neural network models applied in measuring instrument for calculating measurand is suggested.
   介绍了一种用于测量二次仪表中充满管道的过热蒸气流量和载热计算的人工神经网络。