operating instrument的用法和樣例：
例句
- Some switches also contain a rheostat to control the brightness of the instrument panel lights.
一些開關也包含一個可變電阻器，控制儀錶板燈的燈光亮度。 - The control instrument receives the load current signal and speed signal and calculates an instantaneous flow value and a cumulative weight valve.
控制儀錶接收載荷電流信號和速度信號運算一個瞬時流量值和累積重量。
